Something I also wanted to mention would be that the smaller scale RR truss bridges would make excellent roof support trusses when building factory, industrial or motor pool diorama structures in 1/35th or larger scales.
Here is a model system using laser cut wood or heavy card stock that I recently found on eBay. While this particular building system may not be the best on realism, it does provide a good illustration for what I had in mind.
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I am considering doing such a dio with my M4 High Speed Tractor to which I have added considerable engine detail. This cut-away motor pool setting would allow me to realistically set the ammo storage box to the side and expose the added detail of the engine.