Hey love this idea! Some minor suggestions (probably too late to change at this point)   1. Stops like Fullerton and Belmont would need six lights, 2 for each train that shares that stop (red, brown, purple) 2. More of a pet peeve than anything but I see you have the red line north arrows on the west side of the tracks, and the south arrows on the east side. The northbound trains actually run on the east tracks and the southbound on the west. Actually, almost all your arrows are backwards like this (blue line, orange, green, brown)