<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM
FORM 10-Q SEPTEMBER 30, 2000 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE
TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000

                             
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          MAR-31-2001
<PERIOD-END>                               SEP-30-2000
<CASH>                                          26,408
<SECURITIES>                                         0
<RECEIVABLES>                                  579,977<F1>
<ALLOWANCES>                                         0
<INVENTORY>                                     83,671
<CURRENT-ASSETS>                                     0<F2>
<PP&E>                                       2,477,522
<DEPRECIATION>                               1,143,096
<TOTAL-ASSETS>                               3,235,093
<CURRENT-LIABILITIES>                                0
<BONDS>                                      1,096,240
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                        10,563
<OTHER-SE>                                     670,295
<TOTAL-LIABILITY-AND-EQUITY>                 3,235,093
<SALES>                                        113,961
<TOTAL-REVENUES>                               963,343
<CGS>                                           65,974
<TOTAL-COSTS>                                  728,181
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                 2,052
<INTEREST-EXPENSE>                              44,052
<INCOME-PRETAX>                                122,084
<INCOME-TAX>                                    43,239
<INCOME-CONTINUING>                             78,845
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    78,845
<EPS-BASIC>                                       3.35
<EPS-DILUTED>                                     3.35
<FN>
<F1>THE VALUE FOR RECEIVABLES REPRESENTS THEIR AMOUNT NET OF THEIR ALLOWANCES.
<F2>AN UNCLASSIFIED BALANCE SHEET EXISTS IN THE REGISTRANT'S FINANCIAL
STATEMENTS.
</FN>