Truss Bridge Kit - for Thomas trains!

This thing is a derivative of both:
* tc_fea's Truss Bridge Kit http://www.thingiverse.com/thing:6749
* Clothbot's Toy Train Track (Small - 54mm) http://www.thingiverse.com/thing:1124

Unfortunately, OpenSCAD had a problem opening Clothbot's file, so I had to run it through Netfabb to fix up the STL. It had even more of a problem with tc_fea's STL so I had to recreate it from measurements in his Sketchup file since I couldn't get a workable copy out of Netfabb.

In any case, I cropped the