Alright, I'll try to integrate some of that into the next update.
Colour coded tubes/rails and better rail connector visuals should be easy enough.
Monolithic structures indicating where the room connectors lead will probably be an issue in the first two zones due to the style and setting (I already have that in the other zones, but of course that's not particularly useful at the start of the game), but I'll see what I can do.
Thanks again for the feedback!