FORM 11-K




                   (X) ANNUAL REPORT PURSUANT TO SECTION 15(d)
                     OF THE SECURITIES EXCHANGE ACT OF 1934

                   FOR THE FISCAL YEAR ENDED DECEMBER 31, 1998

                                       OR

                 ( ) TRANSITION REPORT PURSUANT TO SECTION 15(d)
                     OF THE SECURITIES EXCHANGE ACT OF 1934
              For the transition period from _________ to _________

                          COMMISSION FILE NUMBER 1-3672









                     CENTRAL ILLINOIS PUBLIC SERVICE COMPANY
                               EMPLOYEE LONG-TERM
                           SAVINGS PLAN - IBEW NO. 702



                           Issuer: Ameren Corporation


                              1901 Chouteau Avenue
                            St. Louis, Missouri 63103
                          (Principal Executive Office)





CENTRAL ILLINOIS PUBLIC SERVICE COMPANY
EMPLOYEE LONG-TERM SAVINGS PLAN - IBEW NO. 702
Report, Financial Statements and Additional Information
December 31, 1998



CENTRAL ILLINOIS PUBLIC SERVICE COMPANY
Employee Long-Term Savings Plan - IBEW NO. 702
Report, Financial Statements and Additional Information
Index
December  31,  1998
________________________________________________________________________________




                                                                       Page


Report of Independent Accountants                                        1


Statement of Net Assets Available for Benefits
 with Fund Information at December 31, 1998
 and December 31, 1997                                                 2 - 5


Statement of Changes in Net Assets  Available for Benefits
 with Fund Information for the years ended December 31, 1998
 and December 31, 1997                                                 6 - 9


Notes to Financial Statements                                         10 - 19


Additional Information*:
         Line 27a - Schedule of Assets Held for
          Investment Purposes at December 31, 1998                   Schedule I

         Line 27d - Schedule of Reportable
          Transactions for the year ended
          December 31, 1998                                          Schedule II

* Other schedules required by Section 2520.103-10 of the Department of Labor
Rules and Regulations for Reporting and Disclosure under ERISA have been omitted
because they are not applicable.



                        Report of Independent Accountants


June 25, 1999

To the Board of Directors of
Central Illinois Public Service Company and the
 Participants of the Central Illinois Public Service
 Company Employee Long-Term Savings Plan,
 IBEW No. 702



In our opinion, the accompanying statements of net assets available for benefits
with fund  information  and the  related  statements  of  changes  in net assets
available for benefits with fund  information  present  fairly,  in all material
respects,  the net assets  available for benefits of the Central Illinois Public
Service Company  Employee  Long-Term  Savings Plan, IBEW No. 702 at December 31,
1998 and 1997,  and the changes in net assets  available  for  benefits  for the
years then ended, in conformity with generally accepted  accounting  principles.
These financial statements are the responsibility of the Plan's management;  our
responsibility  is to express an opinion on these financial  statements based on
our audits.  We conducted  our audits of these  statements  in  accordance  with
generally accepted auditing standards which require that we plan and perform the
audit to obtain reasonable  assurance about whether the financial statements are
free of material  misstatement.  An audit includes  examining,  on a test basis,
evidence  supporting the amounts and  disclosures  in the financial  statements,
assessing the  accounting  principles  used and  significant  estimates  made by
management,  and evaluating the overall  financial  statement  presentation.  We
believe  that our audits  provide a reasonable  basis for the opinion  expressed
above.

Our audits  were  conducted  for the  purpose of forming an opinion on the basic
financial  statements taken as a whole. The additional  information  included in
Schedules I and II is presented for purposes of additional analysis and is not a
required part of the basic  financial  statements but is additional  information
required by the  Department of Labor's Rules and  Regulations  for Reporting and
Disclosure  under the Employee  Retirement  Income  Security Act of 1974.  These
supplemental  schedules are the  responsibility  of the Pla's  management.  The
supplemental schedules have been subjected to the auditing procedures applied in
the audits of the basic  financial  statements  and, in our opinion,  are fairly
stated in all material  respects in relation to the basic  financial  statements
taken as a whole.

/s/ PricewaterhouseCoopers LLP





CENTRAL ILLINOIS PUBLIC SERVICE COMPANY
Employee Long-Term Savings Plan - IBEW No. 702
Statement of Net Assets Available for Benefits, with Fund Information
December 31, 1998
Page 2
________________________________________________________________________________




                                       Ameren
                                       Common       Bond       Money        Growth        S&P 500     Retirement     AIM
                                       Stock        Index      Market       Equity        Equity       Preserv.     Value
                                       Fund         Fund        Fund         Fund       Index Fund      Trust        Fund

Assets

                                                                                           
Investments at fair value           $8,546,226   $1,044,257   $1,379,710   $6,408,322   $7,285,868   $  323,867   $1,727,473

Dividends and interest receivable        1,541          275          134          913          872          234          577

Contributions receivable:
    Participant                         43,790        7,745        7,039       33,972       39,069        2,832       15,597
    Employer                             4,370          697          601        3,117        3,733          187        1,233
                                    ----------   ----------   ----------   ----------   ----------   ----------   ----------
                                        48,160        8,442        7,640       37,089       42,802        3,019       16,830
                                    ----------   ----------   ----------   ----------   ----------   ----------   ----------

Net assets available for benefits   $8,595,927   $1,052,974   $1,387,484   $6,446,324   $7,329,542   $  327,120   $1,744,880
                                    ==========   ==========   ==========   ==========   ==========   ==========   ==========


   The accompanying notes are an integral part of these financial statements.



CENTRAL ILLINOIS PUBLIC SERVICE COMPANY
Employee Long-Term Savings Plan - IBEW No. 702
Statement of Net Assets Available for Benefits, with Fund Information(continued)
December 31, 1998
Page 3
________________________________________________________________________________




                                       Global                                   Pending        Participant
                                      Allocation     Capital        Cash       Settlement         Loan
                                        Fund          Fund          Fund          Fund            Fund          Total

Assets

                                                                                         
Investments at fair value           $   269,117   $   356,484   $   (10,484)   $       483    $ 1,373,224    $28,704,547

Dividends and interest receivable           138           121         7,809           --             --           12,614

Contributions receivable:
    Participant                           3,842         4,811          --             --          (18,663)       140,034
    Employer                                304           445          --             --             --           14,687
                                    -----------   -----------   -----------    -----------    -----------    -----------
                                          4,146         5,256          --             --          (18,663)       154,721
                                    -----------   -----------   -----------    -----------    -----------    -----------

Net assets available for benefits   $   273,401   $   361,861   $    (2,675)   $       483    $ 1,354,561    $28,871,882
                                    ===========   ===========   ===========    ===========    ===========    ===========



   The accompanying notes are an integral part of these financial statements.




CENTRAL ILLINOIS PUBLIC SERVICE COMPANY
Employee Long-Term Savings Plan - IBEW No. 702
Statement of Net Assets Available for Benefits, with Fund Information
December 31, 1997
Page 4
________________________________________________________________________________




                                      Ameren
                                      Common        Bond         Money      Growth        S&P 500     Retirement       AIM
                                      Stock         Index       Market      Equity        Equity       Preserv.       Value
                                       Fund         Fund         Fund        Fund       Index Fund      Trust         Fund

Assets

                                                                                           
Investments at fair value           $8,137,853   $  904,447   $1,096,019   $4,552,267   $4,907,904   $  181,950   $  825,729

Dividends and interest receivable        2,951          374          188        1,425        1,516           13          451

Contributions receivable:
    Participant                         84,427       11,413        8,828       46,689       49,797          888       11,201
    Employer                             4,971          670          576        2,827        3,015           54          670
                                    ----------   ----------   ----------   ----------   ----------   ----------   ----------
                                        89,398       12,083        9,404       49,516       52,812          942       11,871
                                    ----------   ----------   ----------   ----------   ----------   ----------   ----------

Net assets available for benefits   $8,230,202   $  916,904   $1,105,611   $4,603,208   $4,962,232   $  182,905   $  838,051
                                    ==========   ==========   ==========   ==========   ==========   ==========   ==========



   The accompanying notes are an integral part of these financial statements.



CENTRAL ILLINOIS PUBLIC SERVICE COMPANY
Employee Long-Term Savings Plan - IBEW No. 702
Statement of Net Assets Available for Benefits, with Fund Information(continued)
December 31, 1997
Page 5
________________________________________________________________________________




                                       Global                                   Pending        Participant
                                     Allocation      Capital       Cash        Settlement         Loan
                                        Fund          Fund         Fund           Fund            Fund         Total

Assets

                                                                                         
Investments at fair value           $   201,649   $   228,961   $      (320)   $    53,379    $ 1,094,565    $22,184,403

Dividends and interest receivable           146           103         5,503           --             --           12,670

Contributions receivable:
    Participant                           5,107         4,960          --             --          (36,531)       186,779
    Employer                                322           308          --             --             --           13,413
                                    -----------   -----------   -----------    -----------    -----------    -----------
                                          5,429         5,268          --             --          (36,531)       200,192
                                    -----------   -----------   -----------    -----------    -----------    -----------

Net assets available for benefits   $   207,224   $   234,332   $     5,183    $    53,379    $ 1,058,034    $22,397,265
                                    ===========   ===========   ===========    ===========    ===========    ===========



   The accompanying notes are an integral part of these financial statements.



CENTRAL ILLINOIS PUBLIC SERVICE COMPANY
Employee Long-Term Savings Plan - IBEW No. 702
Statement of Changes in Net Assets Available for Benefits, with Fund Information
For the Year Ended December 31, 1998
Page 6
________________________________________________________________________________




                                           Ameren
                                           Common          Bond         Money        Growth        S&P 500       Retirement     AIM
                                            Stock         Index         Market       Equity        Equity         Preserv.     Value
                                            Fund           Fund         Fund          Fund       Index Fund        Trust       Fund

Additions to net assets attributed to:

                                                                                                    
    Participant contributions           $   879,100    $  158,776    $  121,159   $   750,180    $   835,077   $  38,146   $ 284,293
    Employee contributions                   70,148        11,376         9,427        50,037         57,979       2,562      18,291
    Dividends and interest                  516,349         4,756        67,481        19,718         23,125      13,446     115,443
    Net appreciation (depreciation)
     in fair value of investments           (36,167)       86,653          --       1,170,296      1,560,614        --       294,460
                                        -----------    ----------    ----------   -----------    -----------   ---------   ---------

    Total additions                       1,429,430       261,561       198,067     1,990,231      2,476,795      54,154     712,487
                                        -----------    ----------    ----------   -----------    -----------   ---------   ---------


Deductions from net assets
 attributed to:
    Distributions                           348,053         34,444       37,203        68,054        128,537       6,793      56,909
    Administrative expenses                   2,034            164          103           804          1,289          55         195
                                        -----------    -----------    ---------   -----------    -----------   ---------   ---------

    Total deductions                        350,087         34,608       37,306        68,858        129,826       6,848      57,104
                                        -----------    -----------    ---------   -----------    -----------   ---------   ---------

Net transfers between funds and plans      (713,618)       (90,883)     121,112       (78,257)        20,341      96,909     251,446
                                        -----------    -----------    ---------   -----------    -----------   ---------   ---------

Increase in net assets
 available for benefits                     365,725        136,070      281,873     1,843,116      2,367,310     144,215     906,829

Net assets available for benefits,
 Beginning of year                        8,230,202        916,904    1,105,611     4,603,208      4,962,232     182,905     838,051
                                        -----------    -----------    ---------   -----------    -----------   ---------   ---------


 End of year                            $ 8,595,927    $ 1,052,974  $ 1,387,484   $ 6,446,324    $ 7,329,542 $   327,120 $ 1,744,880
                                        -----------    -----------  -----------   -----------    ----------- -----------   ---------



   The accompanying notes are an integral part of these financial statements.



CENTRAL ILLINOIS PUBLIC SERVICE COMPANY
Employee Long-Term Savings Plan - IBEW No. 702
Statement of Changes in Net Assets Available for Benefits,
with Fund Information (continued)
For the Year Ended December 31, 1998
Page 7
________________________________________________________________________________




                                             Global                                      Pending       Participant
                                           Allocation      Capital          Cash        Settlement         Loan
                                              Fund           Fund           Fund           Fund            Fund            Total

Additions to net assets attributed to:

                                                                                                   
    Participant contributions           $     85,414    $    104,845    $       --      $       --      $       --     $  3,256,990
    Employe contributions                      5,426           7,151            --              --              --          232,397
    Dividends and interest                    32,972          22,123           2,306            --              --          817,719
    Net appreciation (depreciation)
     in fair value of investments            (28,267)         (1,728)           --              --              --        3,045,861
                                        ------------    ------------    ------------    ------------    ------------   ------------

    Total additions                           95,545         132,391           2,306            --              --        7,352,967
                                        ------------    ------------    ------------    ------------    ------------   ------------


Deductions from net assets
 attributed to:
    Distributions                             16,164           9,635            --              --            35,045        740,837
    Administrative expenses                       24              53            --              --              --            4,721
                                        ------------    ------------    ------------    ------------    ------------   ------------

    Total deductions                          16,188           9,688            --              --            35,045        745,558
                                        ------------    ------------    ------------    ------------    ------------   ------------

Net transfers between funds and plans        (13,180)          4,826         (10,164)        (52,896)        331,572       (132,792)
                                        ------------    ------------    ------------    ------------     -----------    -----------

Increase (decrease) in net assets
 available for benefits                       66,177         127,529          (7,858)        (52,896)        296,527      6,474,617

Net assets available for benefits,
 Beginning of year                           207,224         234,332           5,183          53,379       1,058,034     22,397,265
                                        ------------    ------------    ------------    ------------    ------------   ------------


 End of year                            $    273,401    $    361,861    $     (2,675)   $        483    $  1,354,561   $ 28,871,882
                                        ------------    ------------    ------------    ------------    ------------   ------------



   The accompanying notes are an integral part of these financial statements.



CENTRAL ILLINOIS PUBLIC SERVICE COMPANY
Employee Long-Term Savings Plan - IBEW No. 702
Statement of Changes in Net Assets Available for Benefits, with Fund Information
For the Year Ended December 31, 1997
Page 8
________________________________________________________________________________




                                           Ameren
                                           Common         Bond          Money       Growth       S&P 500       Retirement      AIM
                                            Stock         Index        Market       Equity        Equity        Preserv.      Value
                                            Fund          Fund          Fund         Fund       Index Fund       Trust        Fund

Additions to net assets attributed to:

                                                                                                   
    Participant contributions            $ 1,140,575    $ 157,739   $   125,818   $   656,834   $   686,614   $  13,487   $ 152,186
    Employer contributions                    43,417        5,872         5,074        24,708        26,363         478       5,817
    Dividends and interest                   415,322        4,193        48,129        14,193        16,557       6,884      78,928
    Net appreciation (depreciation)
     in fair value of investments          1,553,870       78,841          --       1,040,375     1,204,279        --        38,944
                                         -----------    ---------   -----------   -----------   -----------   ---------   ---------

    Total additions                        3,153,184      246,645       179,021     1,736,110     1,933,813      20,849     275,875
                                         -----------    ---------   -----------   -----------   -----------   ---------   ---------


Deductions from net assets
 attributed to:
    Distributions                            444,314       21,218        27,186       192,110       225,012        --         4,720
    Administrative expenses                    2,168          118           217           880         1,029           2         152
                                         -----------    ---------   -----------   -----------   -----------   ---------   ---------

    Total deductions                         446,482       21,336        27,403       192,990       226,041           2       4,872
                                         -----------    ---------   -----------   -----------   -----------   ---------   ---------

Net transfers between funds and plans       (750,740)      89,483       268,285       287,967       288,159      50,244     172,852
                                         -----------    ---------   -----------   -----------    ----------   ---------   ---------

Increase in net assets
 available for benefits                    1,955,962      314,792       419,903     1,831,087     1,995,931      71,091     443,855

Net assets available for benefits,
 Beginning of year                         6,274,240      602,112       685,708     2,772,121     2,966,301     111,814     394,196
                                         -----------    ---------   -----------   -----------   -----------   ---------   ---------


  End of year                            $ 8,230,202    $ 916,904   $ 1,105,611   $ 4,603,208   $ 4,962,232   $ 182,905   $ 838,051
                                         -----------    ---------   -----------   -----------   -----------   ---------   ---------



   The accompanying notes are an integral part of these financial statements.



CENTRAL ILLINOIS PUBLIC SERVICE COMPANY
Employee Long-Term Savings Plan - IBEW No. 702
Statement of Changes in Net Assets Available for Benefits,
 with Fund Information (continued)
For the Year Ended December 31, 1997
Page 9
________________________________________________________________________________




                                             Global                                    Pending      Participant
                                           Allocation       Capital        Cash       Settlement       Loan
                                              Fund           Fund          Fund         Fund           Fund         Total

Additions to net assets attributed to:

                                                                                             
    Participant contributions            $    74,478    $    75,440    $      --     $      --     $      --     $ 3,083,171
    Employer contributions                     2,769          2,674           --            --            --         117,172
    Dividends and interest                    26,081         18,573          2,242          --            --         631,102
    Net appreciation (depreciation)
     in fair value of investments             (9,445)        15,894           --            --            --       3,922,758
                                         -----------    -----------    -----------   -----------   -----------   -----------

    Total additions                           93,883        112,581          2,242          --            --       7,754,203
                                         -----------    -----------    -----------   -----------   -----------   -----------


Deductions from net assets
 attributed to:
    Distributions                               --             --             --            --          24,747       939,307
    Administrative expenses                       71             43             40          --            --           4,720
                                         -----------    -----------    -----------   -----------   -----------   -----------

    Total deductions                              71             43             40          --          24,747       944,027
                                         -----------    -----------    -----------   -----------   -----------   -----------

Net transfers between funds and plans        (12,230)        (4,697)           844        53,358       313,089       756,614
                                         -----------    -----------    -----------   -----------   -----------   -----------

Increase in net assets
 available for benefits                       81,582        107,841          3,046        53,358       288,342     7,566,790

Net assets available for benefits,
 Beginning of year                           125,642        126,491          2,137            21       769,692    14,830,475
                                         -----------    -----------    -----------   -----------   -----------   -----------


  End of year                            $   207,224    $   234,332    $     5,183   $    53,379   $ 1,058,034   $22,397,265
                                         -----------    -----------    -----------   -----------   -----------   -----------



   The accompanying notes are an integral part of these financial statements.




CENTRAL ILLINOIS PUBLIC SERVICE COMPANY
Employee Long-Term Savings Plan - IBEW NO. 702
Notes to Financial Statements
December 31, 1998
Page 10
________________________________________________________________________________

1.     Description of the plan

       General
       The following  description of the Plan provides only general information.
       For a more complete  description of the Plan's provisions,  a copy of the
       Plan document is available upon request from the Plan Administrator.

       The Central  Illinois Public Service Company (the Company) is an Illinois
       corporation  which is a  wholly-owned  subsidiary  of Ameren  Corporation
       (Ameren),  a holding company formed upon completion of the merger between
       Union Electric Company and CIPSCO Incorporated (the Merger).  The Company
       adopted the Employee  Long-Term Savings Plan - IBEW No. 702 (the Plan) on
       January 1, 1990, to provide a systematic  means by which certain eligible
       employees of the Company may adopt a regular  savings  program and secure
       federal income tax benefits resulting from participation in the Plan. The
       Plan is a defined  contribution  plan subject to the Employee  Retirement
       Income Security Act of 1974 (ERISA). The Plan provides for the investment
       in certain funds held under the Plan for each participating employee (the
       Participant).

       A  committee  (the  Committee)  consisting  of  at  least  three  persons
       appointed by the Company  administers  the Plan.  The  Committee  has the
       power to adopt rules and regulations as deemed  necessary or advisable to
       carry  out the  Plan in  accordance  with its  terms.  No  member  of the
       Committee who is an employee of the Company may receive any  remuneration
       for  services  performed in this  capacity as a member of the  Committee.
       Merrill Lynch Trust  Company of America (the  Trustee)  serves as trustee
       under terms of the Master Trust.

       Participation
       Each  employee of the Company  receiving  regular  salary or wages who is
       part of the IBEW Local No.  702  collective  bargaining  unit and who has
       both completed one year of service (defined as a consecutive twelve-month
       period beginning with his/her employment commencement date or anniversary
       thereof  during  which  he/she  has  completed  at least  1,000  hours of
       service)  and  has  attained  the  age  of 21 is  eligible  to  become  a
       Participant.  The  total  number of  active  participants  in the Plan at
       December 31, 1998 was approximately 566.

       Contributions
       The Plan permits a participant to make  contributions to the Plan through
       payroll  reductions from 1% up to 15% of the  Participant's  compensation
       (as   defined).   In  order  to   insure   compliance   with   applicable
       nondiscrimination   requirements  of  the  Internal   Revenue  Code,  the
       Committee,  in accordance  with the Plan, has limited highly  compensated
       participant  reductions  to 10%.  The Tax Reform Act of 1986  limited the
       maximum annual amount that may be contributed by a Participant to $10,000
       in 1998



CENTRAL ILLINOIS PUBLIC SERVICE COMPANY
Employee Long-Term Savings Plan - IBEW NO. 702
Notes to Financial Statements
December 31, 1998
Page 11
________________________________________________________________________________



       and $9,500 in 1997. The Company  transfers to the Master Trust the amount
       designated  by the Participant  where it  is  placed  in a  Participant's
       account no less frequently  than  semi-monthly.  The Company shall make a
       matching  contribution  equal  to  15%  of  the  amount  of  compensation
       reduction   contributions,  not  to   exceed  5%  of  the   participant's
       compensation  while  an  active  participant  for  such  payroll  period.
       Contributions  are  invested  in   accordance  with   the   Participant's
       directions in one or more of the Funds.  Employees  may make  "qualifying
       rollover  contributions"  of amounts  received  as a  distribution from a
       prior employer's plan.

       Vesting
       The amounts in a  Participant's  Account  are fully  vested at all times.
       Since  Company  contributions  vest  immediately,   forfeitures  are  not
       applicable.

       Investment options
       Ameren  Common  Stock  Fund - This  fund  invests  in  shares  of  Ameren
       Corporation  common stock which the trustee  purchases in the open market
       from  time  to  time.  Upon  consummation  of  the  Merger,   the  common
       stockholders of CIPSCO received 1.03 shares of Ameren  Corporation common
       stock,  par value $.01 per share,  for each share of CIPSCO  common stock
       and became  stockholders of Ameren. All activity in the Common Stock Fund
       is reported in these financial  statements as Ameren  Corporation  common
       stock  activity,  regardless  of whether  the  transaction  was CIPSCO or
       Ameren Corporation common stock.

       Bond Index Fund - Funds are  invested in the  Barclays  Global  Investors
       Government/Corporate  Bond  Index Fund  which is a  stratified  sample of
       bonds comprising the Lehman Brothers Government/Corporate Bond Index (the
       Bond Index).  The Bond Index is comprised  primarily of U.S.  Government,
       U.S. Agency and corporate bonds.

       Standard & Poor's (S&P) 500 Equity Index Fund - Funds are invested in the
       Merrill Lynch Equity Index Trust, a collective  trust fund  maintained by
       Merrill Lynch Trust  Company.  The  investment  objectives of the Merrill
       Lynch Equity Index Trust are to  approximate  the total return of the S&P
       500 Composite Stock Index (the Equity Index). The investment strategy has
       two  components.  Ordinarily,  over  90%  of the  assets  are  held  as a
       traditional "full replication"  Equity Index portfolio  comprised of all,
       or nearly all, 500 stocks in weightings closely aligned with those of the
       Equity Index.  The balance of the assets are held in a liquidity  pool of
       cash  equivalents  (hedged by  ownershi  of S&P 500  Index  Futures) that
       provide a  return very close  to  the  Equity Index,  while allowing low-
       cost,  efficient  accommodation of  cash flows in and out of  the Merrill
       Lynch Equity Index Trust.

       Money Market Fund - Funds are invested in the Barclays  Global  Investors
       Money  Market  Fund for  Employee  Benefit  Trusts,  which  provides  for
       investment  and  reinvestment  in a variety of money market  instruments,
       including but not limited to



CENTRAL ILLINOIS PUBLIC SERVICE COMPANY
Employee Long-Term Savings Plan - IBEW NO. 702
Notes to Financial Statements
December 31, 1998
Page 12
________________________________________________________________________________

       U.S.  government  and  agency  securities,  bank   obligations  such   as
       certificates of deposit,  banker's  acceptances and fixed-time  deposits,
       short-term  commercial  debt  instruments  such   as  commercial   paper,
       unsecured loan participation or variable rate demand notes and repurchase
       agreements.

       Growth Equity Fund - Funds are invested in a separately managed portfolio
       consisting primarily of equity securities, or securities convertible into
       common  stocks.  A  portion  of the  portfolio  may be  invested  in cash
       equivalents. The portfolio is managed by Merrill Lynch Asset Management.

       Merrill  Lynch  Retirement   Preservation  Trust  -  Funds  are  invested
       primarily in U.S. government and agency securities, guaranteed investment
       contracts  issued   generally  by  insurance   carriers  and  banks,  and
       high-quality  money market  instruments.  This Fund is a collective trust
       fund maintained by Merrill Lynch Trust Company.

       AIM Value Fund - Class A Shares - Funds are invested  primarily in equity
       securities  that are  judged by the  manager to be  undervalued.  The AIM
       Value Fund invests  primarily  in common  stocks,  convertible  bonds and
       convertible preferred stocks, but also may invest in preferred stocks and
       other debt securities.

       Merrill Lynch Global  Allocation Fund - Class A Shares - This fund varies
       the mix of  investments  in United  States and foreign  equity,  debt and
       money market  securities based upon the manager's  evaluation of changing
       market and economic trends.

       Merrill  Lynch  Capital Fund - This fund has a fully  managed  investment
       policy utilizing equity, debt and convertible securities. Consistent with
       policy,  the Capital Fund's portfolio may, at any given time, be invested
       substantially in equity  securities  (stocks),  corporate bonds, or money
       market  securities.  It is the expectation of the investment manager that
       over longer periods, a major portion of the Capital Fund's portfolio will
       consist of equity securities of larger-market capitalization companies.

       Participant  Loan  Fund  -  This  fund  consists  of  amounts  loaned  to
       participants as provided for in the Plan.

       Plan Withdrawals/Loans
       No  withdrawals  from a  Participant's  account are  permitted  while the
       Participant  continues to be employed by the Company  except  that,  upon
       compliance  with the  provisions of the Plan,  one withdrawal may be made
       each  year  in  limited  cases  of  financial   hardship.   In  addition,
       Participants  may make  withdrawals of their rollover  contributions  and
       earnings thereon.

       Upon  application of a Participant and payment of a loan application fee,
       the  Committee  may, in compliance  with the Plan,  direct the Trustee to
       make a loan to the Participant



CENTRAL ILLINOIS PUBLIC SERVICE COMPANY
Employee Long-Term Savings Plan - IBEW NO. 702
Notes to Financial Statements
December 31, 1998
Page 13
________________________________________________________________________________

       from the  Participant's  account upon such   terms as the Committee shall
       specify. Participants' loans are maintained in the Participant Loan Fund.

       Distributions
       Upon  termination  of employment  for any reason,  a Participant  will be
       entitled  to receive the balance in the  Participant's  account  less the
       unpaid  amount of any  outstanding  loan  (including  accrued  interest).
       Generally,  distributions will be made in a lump sum; however, in certain
       circumstances   a   Participant   may  also  elect  to  receive   his/her
       distribution in installments. Certain distributions may be deferred until
       a  participant   reaches  age  70  1/2,  dies,  or  requests  an  earlier
       distribution (whichever occurs first).

       Amounts that have been requested for withdrawal by Participants, but have
       not  yet  been  distributed  by the  Plan,  are  included  in net  assets
       available for benefits. There were no amounts requested for withdrawal by
       Participants, but not yet distributed by the Plan as of December 31, 1998
       or 1997.

       Plan termination
       The Company has a right to terminate  the Plan at any time subject to the
       provisions of ERISA. Upon termination, the Trustee will distribute assets
       remaining in the Trust Fund with the  exception  that,  except in certain
       specified situations,  no distributions shall be made until a participant
       attains age 59 1/2.

2.     Summary of significant accounting policies

       Basis of accounting
       The financial statements of the Plan are prepared on the accrual basis of
       accounting.

       Use of estimates
       The  preparation  of financial  statements in conformity  with  generally
       accepted accounting  principles requires management to make estimates and
       assumptions  that affect the reported  amounts of assets and  liabilities
       and  disclosure of contingent  assets and  liabilities at the date of the
       financial  statements  and the reported  amounts of changes in net assets
       available for benefits during the reporting period.  Actual results could
       differ from those estimates.

       Pending settlements
       Pending settlements  represent accrued income from sales transactions for
       which the trade date is prior to December 31 and the  settlement  date is
       subsequent to December 31.

       Payroll withholdings
       Payroll  withholdings  represent accrued  contributions and employee loan
       repayments that are owed to the Plan as of December 31.



CENTRAL ILLINOIS PUBLIC SERVICE COMPANY
Employee Long-Term Savings Plan - IBEW NO. 702
Notes to Financial Statements
December 31, 1998
Page 14
________________________________________________________________________________

       Investments
       All  investments  are presented at fair value as of December 31, 1998 and
       1997. The fair value of the Ameren Common Stock Fund was determined using
       year-end  published market prices.  Investments in equity  securities and
       bonds are valued at net asset market value  including  accrued  income on
       the last business day of each year.  Investments in the Money Market Fund
       and Merrill Lynch Retirement  Preservation  Trust are valued at cost plus
       accrued income, which approximates  market.  Participant loans are valued
       at cost which approximates fair market value.

       Income
       Interest  income is  recorded on the accrual  basis.  Dividend  income is
       recorded on the ex-dividend date.

       Gains and losses on security transactions are recorded on the trade date.
       Net unrealized  appreciation or depreciation for the year is reflected in
       Net  appreciation  (depreciation)  of  investments  on the  Statement  of
       Changes in Net Assets Available for Benefits.

       Expenses
       In general,  expenses to administer the Plan, including fees and expenses
       of the Trustee,  are paid by the  Company,  except as provided for in the
       Plan. All transaction fees of an investment fund are paid from the assets
       of that investment fund.

       Benefit payments
       Benefit payments are recorded when paid.



CENTRAL ILLINOIS PUBLIC SERVICE COMPANY
Employee Long-Term Savings Plan - IBEW NO. 702
Notes to Financial Statements
December 31, 1998
Page 15
________________________________________________________________________________

3.     Investments

       The following table presents  investments of the Plan.  Investments  that
       represent  five  percent or more of the Plan's net assets  available  for
       benefits at December 31, 1998 and 1997 are separately identified.




                                                             December 31,
                                                         1998            1997
                                                         ----            ----
Investments at Fair Value as
  Determined by Quoted Market Price

                                                             
  Ameren Common Stock                                $ 8,546,226     $ 8,137,853

  Common/Collective Trusts:
     S&P 500 Equity Index Fund                         7,285,868       4,907,904
     Govt/Corp Bond Index Fund                         1,044,257         904,447
     Money Market Fund                                 1,379,710       1,096,019
     Growth Equity Fund                                6,408,322       4,552,267
     Merrill Lynch Retirement
      Preservation Trust                                 323,867         181,950
                                                     -----------     -----------
     Total Common/Collective Trusts                   16,442,024      11,642,587

  Mutual Funds:
     AIM Value Fund                                    1,727,473         825,729
     Merrill Lynch Global Allocation Fund --
         Class A                                         269,117         201,649
     Merrill Lynch Capital Fund -- Class A               356,484         228,961
                                                     -----------     -----------
     Total Mutual Funds                                2,353,074       1,256,339

  Loans to Participants                                1,373,224       1,094,565
                                                     -----------     -----------

Total Investments                                    $28,714,548     $22,131,344
                                                     ===========     ===========




4.     Transactions with parties-in-interest

       At December 31, 1998, the Plan held Ameren  Corporation common stock with
       a cost and  market  value of  $6,751,530  and  $8,546,226,  respectively.
       During 1998, the Plan  purchased  shares at a cost of $2,472,489 and sold
       shares  valued  at  $1,844,516,  resulting  in a  net  realized  gain  of
       $241,855.  The Plan also distributed shares valued at $129,854 to persons
       withdrawing from the Plan.



CENTRAL ILLINOIS PUBLIC SERVICE COMPANY
Employee Long-Term Savings Plan - IBEW NO. 702
Notes to Financial Statements
December 31, 1998
Page 16
________________________________________________________________________________

       At December 31, 1997, the Plan held Ameren  Corporation common stock with
       a cost and  market  value of  $6,043,801  and  $8,137,853,  respectively.
       During 1997, the Plan  purchased  shares at a cost of $2,010,372 and sold
       shares  valued  at  $1,705,055,  resulting  in a  net  realized  gain  of
       $178,459.  The Plan also distributed shares valued at $138,959 to persons
       withdrawing from the Plan.

       The Plan held  $323,867  and  $181,950  in the Merrill  Lynch  Retirement
       Preservation Trust at December 31, 1998 and 1997, respectively. This Fund
       is a collective trust fund with book value approximating market.

       At December  31, 1998,  the Plan held shares in the Merrill  Lynch Equity
       Index Trust with a cost and market value of  $4,281,895  and  $7,285,868,
       respectively.  During  1998,  the  Plan  purchased  shares  at a cost  of
       $1,740,060  and  sold  shares  valued  at  $924,415,  resulting  in a net
       realized gain of $268,437.

       At December  31, 1997,  the Plan held shares in the Merrill  Lynch Equity
       Index Trust with a cost and market value of  $3,196,108  and  $4,907,904,
       respectively.  During  1997,  the  Plan  purchased  shares  at a cost  of
       $1,021,810  and  sold  shares  valued  at  $489,105,  resulting  in a net
       realized gain of $154,430.

       These  transactions  are allowable  party-in-interest  transactions under
       Section 408(b)(8) of the ERISA regulations.

5.     Federal income tax status

       The Plan is  intended  to qualify as a deferred  compensation  plan under
       sections  401  (a)  and 401 (k) of the  Internal  Revenue  Code of  1986.
       Qualification of the Plan means that a Participant will not be subject to
       federal income taxes on amounts contributed to the Participant's account,
       or the earnings or  appreciation  thereon,  until such amounts either are
       withdrawn by the  Participant or are  distributed to the Participant or a
       beneficiary in the event of the  Participant's  death.  Payroll reduction
       contributions  to a Participant's  account reduce the gross income of the
       Participant  for  federal  income  tax  purposes  to  the  extent  of the
       contributions. The Company received a favorable determination letter from
       the  Internal  Revenue  Service  dated  July  29,  1996,  concerning  the
       qualification  of the Plan  under  federal  income  tax  regulations.  In
       addition, the Company also received a favorable determination letter from
       the  Internal   Revenue  Service  dated  December  8,  1986,   concerning
       qualification of the Master Long-Term  Savings Trust under federal income
       tax regulations.  Management believes that the Plan is currently designed
       and is being  operated in compliance  with  requirements  of the Internal
       Revenue  Code  and  that  the  Plan  is tax  exempt  as of the  financial
       statement date.

       Discussions  of  the  federal  income  tax  consequences  of  the  Plans,
       including  consequences on distributions of  Participant's  account,  are
       contained in the Company's  Employee  Long-Term Savings Plan Summary Plan
       Description and Information Statement (dated June 27, 1995).



CENTRAL ILLINOIS PUBLIC SERVICE COMPANY
Employee Long-Term Savings Plan - IBEW NO. 702
Notes to Financial Statements
December 31, 1998
Page 17
________________________________________________________________________________

6.       Participation in Master Trust

       The Central  Illinois  Public Service  Company Master  Long-Term  Savings
       Trust (the Master  Trust) was  established  April 1, 1985 to serve as the
       funding medium for the Plan and for the other separate Employee Long-Term
       Savings  Plans which are for the executive and wage and salary groups and
       the  members  of the IUOE  No.  148  collective  bargaining  unit.  These
       separate  Plans are not included in this report and are shown  separately
       in their own reports.  At December 31, 1998 and 1997, the Plan's interest
       in the net  assets of the  master  trust was  approximately  53% and 19%,
       respectively.

       The master trusts' Statement of Net Assets at December 31, 1998 and 1997,
       and  Statement  of Changes in Net Assets for the Year Ended  December 31,
       1998 and 1997, are detailed on the following pages.



CENTRAL ILLINOIS PUBLIC SERVICE COMPANY
Master Long-Term Savings Trust
Statement of Net Assets Available for Benefits
December 31, 1998 and 1997
Page 18
________________________________________________________________________________




                                                              December 31,
                                                        1998             1997
                                                   -------------    -------------
Investments, at fair value:

                                                            
   Ameren Common Stock Fund                        $  18,123,511    $  36,805,946
   Bond Index Fund                                     1,783,429        5,452,036
   Money Market Fund                                   4,526,474        9,288,591
   Growth Equity Fund                                 10,347,700       29,244,841
   Standard & Poor's (S&P) 500 Equity Index Fund      11,816,384       26,667,330
   Merrill Lynch Retirement Preservation Trust         1,924,488        1,739,564
   AIM Value Fund                                      2,138,823        3,307,802
   Merrill Lynch Global Allocation Fund                  346,163        1,152,945
   Merrill Lynch Capital Fund                            534,042        1,343,244
   Participant Loan Fund                               2,586,939        5,167,490
                                                   -------------    -------------
      Total investments                               54,127,953      120,169,789

Cash                                                     (10,616)          (1,513)

Receivables:

   Pending Settlement                                        498          231,825
   Payroll withholdings                                  222,156          447,815
   Interest and Dividends                                 24,532           57,671
                                                   -------------    -------------

Net assets available for benefits                  $  54,364,523    $ 120,905,587
                                                   =============    =============





CENTRAL ILLINOIS PUBLIC SERVICE COMPANY
Master Long-Term Savings Trust
Statement of Changes in Net Assets Available for Benefits
For the Years Ended December 31, 1998 and 1997
Page 19
________________________________________________________________________________




                                                      Year ended December 31,
                                                      1998             1997
Additions:

                                                         
   Employee contributions                       $   7,238,215    $   8,442,643

   Employer contributions                             232,397          117,172

   Investment income                                3,025,572        3,349,273

   Net appreciation of investments                  7,803,511       20,848,089
                                                -------------    -------------

       Total additions                             18,299,695       32,757,177
                                                -------------    -------------


Deductions:

   Distributions                                    9,659,880        4,570,592

   Administrative expenses                             10,482           13,200
                                                -------------    -------------

       Total deductions                             9,670,362        4,583,792
                                                -------------    -------------

Increase in net assets available for benefits       8,629,333       28,173,385

Net assets available for benefits
   Beginning of year                              120,905,587       92,732,202
                                                -------------    -------------

   End of year                                    129,534,920      120,905,587

Net assets transferred out                        (75,170,397)            --
                                                -------------    -------------

Net assets                                      $  54,364,523    $ 120,905,587
                                                =============    =============





CENTRAL ILLINOIS PUBLIC SERVICE COMPANY                               SCHEDULE I
Employee Long-Term Savings Plan - IBEW No. 702
Item 27a - Schedule of Assets Held for Investment Purposes
December 31, 1998
________________________________________________________________________________




                                                             December 31, 1998
Identity of Issue/Description
  of Investment                                            Cost       Fair Value


Common Stock
                                                             
 <F1>Ameren Corporation, $.01 par                      $ 6,751,530   $ 8,546,226


Common / Collective Trusts
     Barclay's Global Investors Money Market Fund        1,379,709     1,379,710
     Barclay's Global Investors Govt/Corp Bond Index       851,878     1,044,257
<F1> Merrill Lynch Retirement Preservation Trust           323,867       323,867
<F1> Merrill Lynch Equity Index Trust 3                  4,281,895     7,285,868
     Growth Equity Fund                                  3,769,445     6,408,322
                                                       -----------   -----------

                                                        10,606,794    16,442,024


Mutual Funds
     AIM Value Fund                                      1,418,158     1,727,473
<F1> Merrill Lynch Global Allocation Fund Class A          307,700       269,117
<F1> Merrill Lynch Capital Fund Class A                    349,708       356,484
                                                       -----------   -----------

                                                         2,075,566     2,353,074


Participant Loans
<F1> Loans to Participants
       (Interest rates ranging from 7% to 9.75%)         1,373,223     1,373,224
                                                       -----------   -----------


  TOTAL INVESTMENTS                                    $20,807,113   $28,714,548
                                                       ===========   ===========


<FN>
 <F1>  Represents a  party-in-interest
</FN>





CENTRAL ILLINOIS PUBLIC SERVICE COMPANY                              SCHEDULE II
Employee Long-Term Savings Plan - IBEW No. 702
Item 27d - Schedule of Reportable Transactions<F1>
For the Year Ended December 31, 1998
Page 1
________________________________________________________________________________




                                                                                 (f)  Expense
                                                                                   incurred
    (a)Identity of Party/                 (c) Purchase   (d) Selling  (e) Lease      with
    (b)Description of Investment               Price        Price       Rental    transaction

                                                                   
<F2>Ameren Common Stock                     $2,472,489   $     --     $   --     $       --

<F2>Ameren Common Stock                           --      1,844,516       --             --

    BGI Money Market Fund                      974,684         --         --             --

    BGI Money Market Fund                         --        691,868       --             --

<F2>Merrill Lynch Equity Index Trust 3       1,740,060         --         --             --

<F2>Merrill Lynch Equity Index Trust 3            --        924,415       --             --

    Growth Equity Fund                       1,088,206         --         --             --

    Growth Equity Fund                            --        404,083       --             --

<F2>Merrill Lynch Ret. Preservation Trust      673,703         --         --             --

<F2>Merrill Lynch Ret. Preservation Trust         --        449,547       --             --

    AIM Value Fund                           1,351,751         --         --             --

    AIM Value Fund                                --        744,467       --             --


<FN>
<F1> Transactions or series of transactions in excess of 5% of the current value
     of the  Plan's  assets  as of  December  31,  1997 as  defined  in  Section
     2520.103-6 of the Department of Labor Rules and  Regulations  for Reporting
     and Disclosure under ERISA.
<F2> Party-in-interest Transaction
</FN>





CENTRAL ILLINOIS PUBLIC SERVICE COMPANY                              SCHEDULE II
Employee Long-Term Savings Plan - IBEW No. 702
Item 27d - Schedule of Reportable Transactions<F1>
For the Year Ended December 31, 1998
Page 1 - continued
________________________________________________________________________________




                                                           Current
                                                         value of asset
    (a)Identity of Party/                 (g) Cost of  (h)  on transaction   (i) Net Gain
    (b)Description of Investment              Asset         date                 or (Loss)

                                                                    
<F2>Ameren Common Stock                    $2,472,489      $2,472,489          $     --

<F2>Ameren Common Stock                     1,602,661      1,844,516              241,855

    BGI Money Market Fund                     974,684        974,684                 --

    BGI Money Market Fund                     691,868        691,868                 --

<F2>Merrill Lynch Equity Index Trust 3      1,740,060      1,740,060                 --

<F2>Merrill Lynch Equity Index Trust 3        655,978        924,415              268,437

    Growth Equity Fund                      1,088,206      1,088,206                --

    Growth Equity Fund                        267,581        404,083              136,502

<F2>Merrill Lynch Ret. Preservation Trust     673,703        673,703                --

<F2>Merrill Lynch Ret. Preservation Trust     449,547        449,547                --

    AIM Value Fund                          1,351,751      1,351,751                --

    AIM Value Fund                            714,434        744,467               30,033


<FN>
<F1> Transactions or series of transactions in excess of 5% of the current value
     of the  Plan's  assets  as of  December  31,  1997 as  defined  in  Section
     2520.103-6 of the Department of Labor Rules and  Regulations  for Reporting
     and Disclosure under ERISA.
<F2> Party-in-interest Transaction
</FN>





CENTRAL ILLINOIS PUBLIC SERVICE COMPANY                              SCHEDULE II
Employee Long-Term Savings Plan - IBEW No. 702
Item 27d - Schedule of Reportable Transactions<F1>
For the Year Ended December 31, 1998
Page 2
________________________________________________________________________________





                                                                                  (f)  Expense
                                                                                     incurred
    (a)Identity of Party/             (c) Purchase    (d) Selling   (e) Lease          with
    (b)Description of Investment          Price           Price       Rental        transaction

                                                                          
Loan Fund                                794,100            --          -                -

Loan Fund                                   --            519,556       -                -

Pending Settlement Fund                1,923,800            --          -                -

Pending Settlement Fund                     --          1,976,696       -                -

<FN>
<F1> Transactions or series of transactions in excess of 5% of the current value
     of the  Plan's  assets  as of  December  31,  1997 as  defined  in  Section
     2520.103-6 of the Department of Labor Rules and  Regulations  for Reporting
     and Disclosure under ERISA.
<F2> Party-in-interest Transaction
</FN>






CENTRAL ILLINOIS PUBLIC SERVICE COMPANY                              SCHEDULE II
Employee Long-Term Savings Plan - IBEW No. 702
Item 27d - Schedule of Reportable Transactions<F1>
For the Year Ended December 31, 1998
Page 2 - continued
________________________________________________________________________________





                                                            Current
                                                        value of asset
    (a)Identity of Party/             (g) Cost of   (h) on transaction      (i) Net Gain
    (b)Description of Investment           Asset           date                or (Loss)

                                                
Loan Fund                                794,100          794,100                --

Loan Fund                                519,556          519,556                --

Pending Settlement Fund                1,923,800        1,923,800                --

Pending Settlement Fund                1,976,696        1,976,696                --

<FN>
<F1> Transactions or series of transactions in excess of 5% of the current value
     of the  Plan's  assets  as of  December  31,  1997 as  defined  in  Section
     2520.103-6 of the Department of Labor Rules and  Regulations  for Reporting
     and Disclosure under ERISA.
<F2> Party-in-interest Transaction
</FN>






                                    SIGNATURE

     The Plan.  Pursuant to the  requirements of the Securities  Exchange Act of
1934,  the  registrant  has duly caused  this annual  report to be signed on its
behalf by the undersigned hereunto duly authorized.


                                                 CENTRAL ILLINOIS PUBLIC
                                                     SERVICE COMPANY
                                                   EMPLOYEE LONG-TERM
                                               SAVINGS PLAN - IBEW NO. 702


                                                 AMEREN SERVICES COMPANY
                                                    (Administrator)




                                                 By  /s/  Jean M. Hannis
                                                       Jean M. Hannis
                                                       Vice President

June 29, 1999




                                  EXHIBIT INDEX

                             Exhibits Filed Herewith


   Exhibit No.                      Description

       23                 Consent of Independent Accountants