the rails look more like stone then iron. iron scratches differently and reflects light differently as well. but it looks too similar to the rock. however the iron on the wooden posts look more like iron.
Looks nice though the wooden slats on the railroad tracks (rhyming!) look really flat. You could fix this by either painting in some depth, or you could double the geometry and put another layer underneath it thats slightly darker to give the illusion of depth.like this Though this uses an alpha, the principle is exactly…