Beanpole Image
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I think the the last photo is the second bridge. There is another photo available that I believe was taken at the same time, but from on top of either a train car or hill overlooking the western side of the bridge facing north, it shows lots of tents and the buildings/block houses right near the tracks. I also speculate those two photos were taken right before the truss was put in place. The photo I spoke about has timbers piled at each end of the bridge and some possible scaffolding on the west side of the bridge. Haupt said he would not interrupt traffic on the line. A fellow modeler believes that the scaffolding held a a shoo-fly track, but I suspect that each section of the truss was constructed on the scaffold, the corresponding trestle bents removed, once the truss was ready and then the truss slid over, track reconnected and then they started running trains while the second and third trusses were built. Unfortunately all I have is speculation and some almost helpful photographs. Let me