"c VAR 0075 03042 FRE CAR 3R 920-943 MD= 1E-37 " "c REF 0075 LOC 636 WIDTH 9 DK 10 COL 71-79 " "c " "c " "c FREIGHT CAR-MILES, EMPTY, CLASS I RAILROADS " "c ------------------------------------------- " "c " "c NBER SERIES: 03042 " "c AREA COVERED: U.S. " "c UNITS: MILLIONS OF CAR-MILES " "c ANNUAL COVERAGE: NONE " "c QUARTERLY COVERAGE: NONE " "c MONTHLY COVERAGE: 01/1920-08/1943 " "c SEASONAL ADJUSTMENT: NONE " "c SOURCE: INTERSTATE COMMERCE COMMISSION, DATA FOR 1920-1934: " "c "FREIGHT AND PASSENGER SERVICE OPERATING STATISTICS OF CLASS " "c I STEAM RAILWAYS IN THE UNITED STATES"; DATA FOR 1935-1943: " "c "FREIGHT TRAIN PERFORMANCE OF CLASS I STEAM RAILWAYS IN THE " "c UNITED STATES" " "c " "c NOTES: SWITCHING AND TERMINAL COMPANIES ARE EXCLUDED. " "c THE UNADJUSTED FIGURE FOR JANUARY 1920 WAS DERIVED BY " "c SUBTRACTING THE KNOWN FEBRUARY FIGURE FROM A TWO-MONTH " "c CUMULATIVE TOTAL. " "c " "c CHECKED MANUALLY; NO CORRECTIONS NECESSARY. " "c " "c ............................................................... "