I think the rails are the only part in need of optimization. It has 10,468 polys with the rails, and 6,068 polys without them. It actually still looks good without them, too, so I might just leave them out completely if I can't get the alpha textures to work.
Here is the revised version. I changed the colors, did some slight optimization, and took out the rails; so now it only has 5,940 polys.
Image Insert: 86.32 KB