Nice, the catenary is looking GREAT, I love it.
Have you considered putting lights in the tunnels? Even if there is just a hint, My dad did it and it gives a awesome perspective to the scenery.
Mmmmmmmm, true about the two big buildings together. Then you must try to find some pictures on the net and see how you can make the Coal Mine look believable, I'm sure there must be something.
Cheers,
Evert