Liked it alot! lots of potential. Couple of points:
Had trouble switching arrow direction, was clicking, clicking and dragging but nothing happened.
This is probably something you get used to but I really wanted to move the camera by holding the left mouse button and turning, using right button wasnt as natural probably because most other games allow you to use left click.
The pixel shader is nice, but sometimes it was hard seeing stuff, maybe you can use HUDs to signal train directions or take offs more clearly.
Good luck :)