<ARTICLE> 5
<MULTIPLIER> 1,000
       
                             
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                          DEC-31-1996
<PERIOD-END>                               MAR-31-1996
<CASH>                                         120,069
<SECURITIES>                                         0
<RECEIVABLES>                                   37,517
<ALLOWANCES>                                         0
<INVENTORY>                                     16,938
<CURRENT-ASSETS>                               206,215
<PP&E>                                       5,734,393
<DEPRECIATION>                               2,024,871
<TOTAL-ASSETS>                               3,946,779
<CURRENT-LIABILITIES>                          103,513
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                             0
<OTHER-SE>                                           0
<TOTAL-LIABILITY-AND-EQUITY>                 3,946,779
<SALES>                                              0
<TOTAL-REVENUES>                               428,784
<CGS>                                                0
<TOTAL-COSTS>                                  403,133
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                               5,043
<INCOME-PRETAX>                                 34,632
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                             34,632
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    34,632
<EPS-PRIMARY>                                     5.28
<EPS-DILUTED>                                     5.28