Just a suggestion from me, I know the HUD gives you symbols and stuff to tell you about what's happening and it tells you if you can't apply power (big step from TSW2020 which didn't tell you either), however, personally I'd like it so if you try to apply power and can't, the game tells you in words (maybe a little pop-up on the side), or indicates why. Just a thought and totally not related to the fact I spent 10 minutes trying to move a tube train without realising the doors are open....
