When you print the track are you printing the rails in plastic, too? Most model trains need metal rails to pick up electricity to run unless they're battery powered.
Here's the interurban car I've been working on - everything shown was 3-D printed:
The pilot is brass - the way I understand it, Shapeways actually prints brass items in wax, then dips them in a ceramic compound that hardens into a mold which is heated so the wax melts and drains out. The wax is then replaced with molten brass producing the 3-D part.
I added a drive unit, but I'm not happy with the floor/frame. I'm going to have to add some lead weights to the frame to get the model to track well over very sharp streetcar curves. These weights will eventually warp the plastic so I will need to find an alternative like low-temperature alloy or pewter that I can make a new frame from. But for now I'll just use some lead sinkers or wheel weights.
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