Engineer-Joe posted:Thanks all.
We have a famous upside down truss in Lockport,NY. I never understood why they put it that way?
It would make it tough to get under to move stuff.
I also like the look of that Plastruct bridge and thought I saw a G scale version too? I might get a couple for the lower G scale if I can make them removable.
Otherwise I would just put a couple of girder bridges underneath the G for better looks.
I really don't want a support right in the middle. I'm getting older and I struggle to duck under there. Usually we send our grandson under to get stuff!
Just looking at the width of the channel, it probably is not wide or deep enough to handle large, deep-draft vessels. So high clearance was not necessary and it was easier to build a deck truss. The height of the bridge above the water may have been dictated by the terrain on either side rather than clearance from water to bridge. I agree that a model bridge without a center support would be much more spectacular. Your sample truss looks like a good start but needs to be deeper.
MELGAR
