I-beam railway bridge - USA Voorschrift, Technical Manual, 5-371 Inspections and Preventive Maintenance Services for Buildings and Structures, Grouds, Roads and Pavements, Railroads - USA Voorschrift, Technical Manual, 5-610 Transportation corps : military railroads and the military railway service - USA War Department Field Manual, FM 55-50 Operation of railroads : Maintenance of way and structures - USA Voorschrift, Technical Manual 55-275 Corps of engineers / War Department : The railway battalion - USA Voorschrift, Training Regulations, No. 445-25 Railway operating rules - USA Voorschrift, Technical Manual, 55-200 Railway track maintenance : repairs and utilities - USA Voorschrift, Technical Manual, 5-627