Renewal project of Canadian National Railways involved replacement of deck truss span over Conestogo river with through truss; replacement span was skidded longitudinally into place over old one which was then lowered to ground.
Bridges can go "Piggy back" too
Ry Track Structures
Railway Track and Structures ; 49 , n 11
1953
3 pages
Article (Journal)
English
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IuD Bahn | 1997
|"Piggy-back" car loads over sides
Engineering Index Backfile | 1953