UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 10-Q/A Amendment No. 1 [X] QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For Quarterly Period Ended September 30, 1998 [ ] TRANSITION REPORT PURSUANT TO SECTION 13 OR 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 (Exact name of registrant as specified in its charter) Illinois 37-0211380 (State or other jurisdiction of (I.R.S. Employer incorporation or organization) Identification No.) 607 East Adams Street, Springfield, Illinois 62739 (Address of principal executive offices and Zip Code) Registrant's telephone number, including area code: (217) 523-3600 Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes X . No . Shares outstanding of each of registrant's classes of common stock as of October 31, 1998: Common Stock, no par value, held by Ameren Corporation (parent company of Registrant) - 25,452,373 PART II. OTHER INFORMATION ITEM 6. EXHIBITS AND REPORTS ON FORM 8-K (a) Exhibits. Exhibit 3(ii)-By-Laws of Central Illinois Public Service Company, as amended as of August 24, 1998 (previously filed). Exhibit 12 - Computation of Ratio of Earnings to Fixed Charges and Preferred Stock Dividend Requirements, 12 Months Ended September 30, 1998 (previously filed). Exhibit 15 - Awareness Letter and Review Reports from inde- pendent accountants regarding unaudited interim financial infor- mation, Three Months Ended March 31, 1998, Six Months Ended June 30, 1998, and Nine Months Ended September 30, 1998. Exhibit 27 - Financial Data Schedule (previously filed). (b) Reports on Form 8-K. The Registrant filed a report on Form 8-K dated September 24, 1998 reporting on the impact of Ameren Corporation's (parent company of the Registrant) employee separation plan and on the effect of the final rule issued in September 1998 by the United States Environmental Protection Agency pertaining to nitrogen oxide emissions. SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized. CENTRAL ILLINOIS PUBLIC SERVICE COMPANY (Registrant) By /s/ Warner L. Baxter ------------------------ Warner L. Baxter Controller Date: December 15, 1998 -2-