bolster beam

bolster beam

A timber or steel beam that supports the end of a bridge truss on an abutment or pier; it is set perpendicular to the trusses. See also: Beam
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved
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It meant that both the axle beam and the bolster beam above it would have to break before the wagon could be rendered helpless.