Thanks Everyone.......
the concrete ends are just made from foam, I cut the basic shape on the band saw, then carved 'em up a little, painted with acrylic craft paint, the bridge is made of basswood, which seems to be stronger than the balsa, but be around the same price, and come in the same sizes.......the only thing I really screwed up was I wish I would have painted or stained my materials before I assembled the bridge, never even thought how hard it would be to get in those little nooks, and crannies, it reduced me to having to have to spray paint it brown.......
maybe you guys could give me some pointers about building to scale though, it seems really hard in n scale since everything has to be so small, there was alot of time spent with a ruler and a micrometer trying to get things reasonably realistic, and in the end I think its still a little too big.....heres a pic with the engine on it..