Mobile bridges. The Heavy Girder Over Bridge (HGOB) was introduced into UK service in 1952 primarily to meet the need for long load Class Bridge in the communications zone of a theatre of war. It is made of high strength steel which is used in the main components, which is supplemented by light alloy materials to save weight in others. It is designed for Military Load Class (MLC) 85 (tracked) and 130 (wheeled) traffic. The components are as large as can be reasonably transported on flatracks. Crane assembly is the normal method of construction, however, it can be hand built but only on operations and in extreme circumstances. The heaviest item is the cross girder which weighs in at 545 Kgs and is used in training. There are 46 of these items in service, and the out of service date is 2025.

CRIB’s are internally braced, rectangle welded steel frameworks which can be clamped together to form bridge piers or supports of various sizes. They come in two sizes; 20 tonne and 50 tonne. There are over 100 of each size in service and has an out of service date of 2025.