> The busses lock down with a PIN when they get out of the seat (generated that morning at the depot) so you can't take it out of neutral anyways to try to steal it.

Huh, it would never have occurred to me to raise the objection "but someone could steal the bus while the driver is in the bathroom!" Why does the bus need to stay in neutral with a special system of daily rotating PINs, rather than having the driver take their key to the bathroom with them?

Transit buses generally actually don't use keys, amusingly. You pop the drivers' window open and reach in for the manual door release, then climb on board.

The headlight switch is also the 'master on' switch for the bus, then you slap an engine starter button and off to the races you go. It's assumed you keep the bus stabled somewhere secure.

https://www.youtube.com/watch?v=1GtuUBEeTVg

https://www.cleverdevices.com/products/secure-bus-access/

Clever Devices is one of the large players of the bus telematics industry and they just sit on the CANbus of the bus (heh!) and block the gear shift from being able to shift over it until you enter the PIN.

If you've ever played with a bus simulator, OMSI 2's Chicago Downtown addon requires you sign onto the bus to take it out of gear, too - you just look up and see the post-it note with that driver's ID and PIN ;)