at were replaced by girder spans twenty years ago have now to be replaced by muchheavier girders. The replacing of one bridge by another is doneunder one of three conditions i.e.1st where traffic isdelayed or diverted to other tracks until the old bridgeis torn out and the new one erected,2nd where… … Replacement toy Skidding. Fij. 14- J L
Bridges · Theses
Internet Archive · University of Illinois Urbana-Champaign · Public Domain Mark 1.0. Free to use for anything.
