Looks really good! I made my first (and last...its been a while since the trains were up) at styrofoam about 12 years ago. My only problem, I used a razor blade. Needless to say I ended up with bandaids on EVERY finger.
Anyway, which program did you say you used to design that? I actually am a mechanical designer and I'd love to know what you used and how I'd get it.
Mike