I-beam railway bridge - USA Voorschrift, Technical Manual, 5-371 Military engineering : Railway bridging : Supplement No. 1A: Additional notes for erection and launching drill - unit construction railway bridge / Army Council. Volume … Military engineering : Railway bridging : Supplement No. 4: Erection of light and heavy steel derricks / Army Council. Volume VIII: Transportation - Engeland Voorschrift, … Military engineering : Railway bridging : Supplement No. 2A: Additional notes on light and standard steel trestles / Army Council. Volume VIII: Transportation - Engeland …