"c           VAR 0067      03012C CO MUT 3R 921-956               MD= 1E-37   "
"c           REF 0067         LOC  564 WIDTH  9             DK   9 COL 62-70  "
"c                                                                            "
"c                                                                            "
"c              RAILROAD REVENUE PASSENGER-MILES, COMMUTATION, CLASS I        "
"c              RAILROADS                                                     "
"c              ------------------------------------------------------        "
"c                                                                            "
"c              NBER SERIES:  03012C                                          "
"c              AREA COVERED:  U.S.                                           "
"c              UNITS:  MILLIONS OF PASSENGER-MILES                           "
"c              ANNUAL COVERAGE:  NONE                                        "
"c              QUARTERLY COVERAGE:  NONE                                     "
"c              MONTHLY COVERAGE:  07/1921-06/1956                            "
"c              SEASONAL ADJUSTMENT:  NONE                                    "
"c              SOURCE:  INTERSTATE COMMERCE COMMISSION, REVENUE TRAFFIC      "
"c              STATISTICS OF CLASS I STEAM RAILWAYS                          "
"c                                                                            "
"c              NOTES:  DATA BEGINNING JUNE 1955 ARE PRELIMINARY.             "
"c                                                                            "
"c              CHECKED MANUALLY; NO CORRECTIONS NECESSARY.                   "
"c                                                                            "
"c           ...............................................................  "