Its difficult to make a judgement of these pics, as most of the route looks unfinished. However, I have to say that those textures are truly awful. They need to blend in with each other and not look like grannys old gaudy curtains. Sorry to be blunt, I am just offering my honest opinion. The landscaping and terrain on the other hand looks convincing, if a tad unrealistic in places (a real railway surveyor would have not created such huge cuttings: either go around or use a tunnel as you have in other places) so don't let it down with sloppy texturing.
Best wishes,
Padster