It was also fights between guests over riding. Fights with the drivers when they wouldn't let someone ride because their train was not based in the station they were trying to board in as well as fights over how many people could ride in the cab (they're just little kids so I should be able to bring five of them since that would equal four adults), etc. They would get pissed off if the train they were waiting for couldn't accommodate them because the driver was training. There were so many problems.
Guests also would touch controls when the drivers stepped out to load and unload the trains, bump into the circuit breakers on the wall, etc. And, with the trains aging the AC doesn't work particularly well in the cabs most of the time, adding more body heat didn't help. Now a large section of the seats in the cabs have been removed for the new computer units for the train control system (which puts out even more heat).