MIL-R-52760A, MILITARY SPECIFICATION: RAILWAY CAR, BOX, END AND SIDE DOORS, 56-1/2-INCH GAGE, 70-TON, 8-WHEEL, FOR DOMESTIC SERVICE (24 FEB 1977)

MIL-R-52760A, MILITARY SPECIFICATION: RAILWAY CAR, BOX, END AND SIDE DOORS, 56-1/2-INCH GAGE, 70-TON, 8-WHEEL, FOR DOMESTIC SERVICE (24 FEB 1977)., This specification covers a steel sheathed boxcar with side and ed door openings for domestic service.