This is a good one :D easy to fix. Makes me remember a bug I had a long long time in a different project ago where you could stop an elevator mmidfloor and there was emptiness beyond the door. Someone did something they shouldn't and the game didn't act properly. Thanks for the info :)
Why fix? This could also become a feature, I thought it was actually quite nice to ride it. Jump up and get off at the next station. If you're too slow, you get through an energy barrier and get disassembled into your atoms. The train could also go round in circles and you look at the current level (sightseeing).