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Prototype information for the modeler
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Campbell Wooden Truss Bridges and a bit of Central Valley
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<p>In my first post in this thread I linked the former Spokana Internationat/Union Pacific Kootenay River bridge in Bonners ferry:</p> <p><a href="http://www.moosecreek.ch/bilder/history-prototype-rallroads.html/history-howe-truss-bridge.pic/pic1.jpg">http://www.moosecreek.ch/bilder/history-prototype-rallroads.html/history-howe-truss-bridge.pic/pic1.jpg</a></p> <p>The photo shows a UP SD40-2 crossing the bridge in 1975, ten years before the bridge collapsed under a ballast train.</p> <p>Here is a photo of four spans of the bridge which replaced one from 1905 in 1932:</p> <p><a href="https://scontent.ftxl1-1.fna.fbcdn.net/v/t31.0-8/14107718_1407057409311400_5919361048315271317_o.jpg?oh=f47fbb4bef6ff0b8551bad62b645de40&oe=5AACC040">https://scontent.ftxl1-1.fna.fbcdn.net/v/t31.0-8/14107718_1407057409311400_5919361048315271317_o.jpg?oh=f47fbb4bef6ff0b8551bad62b645de40&oe=5AACC040</a></p> <p>So single wooden Howe truss briges were used by heavy trains into the 1980s.<br />I would assume that there were speed limit and brake restrictions in place on that bridge.</p> <p>Perhaps a poor railroad would build a river crossing with wooden truss bridges. But a navigation channel needed a larger span so a steel truss was used.</p> <p>Remember the CV truss bridge follows an early prototype, the SP Piru, CA bridge built in 1902: <a href="https://scvhistory.com/scvhistory/lw2461a.htm">https://scvhistory.com/scvhistory/lw2461a.htm</a></p> <p>Regards, Volker</p>
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