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At the outset of World War II, the United States Army sought a versatile bridge that
could span a variety of gaps and be quickly assembled by manpower alone. The Bailey bridge is a through-type
truss bridge with the roadway being carried between two main girders. The trusses in each girder are formed
by 10-foot panels pinned end to end. In this respect, the Bailey bridge is often referred to as a "panel"
or "truss" bridge.
Each part of the Bailey bridge is a standard machine-made piece and is interchangeable
among spans. In most cases, no heavy equipment is required to assemble or launch a Bailey bridge; only basic
pioneer skills and equipment are needed.
Standard parts can be used to assemble seven standard designs for efficient single
spans from 30 to 210 feet long. With minor nonstandard modifications, the expedient uses of bridge parts
are limited only by the user's imagination. The bridge can be assembled to meet varying conditions of span
and load. Capabilities ranging from pedestrian to locomotive structures are common.
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