It’s been a long time since I was down there, but I don’t think there is an easy access from the lower level to the station level for any type of machinery.
None. You can transfer to another Crew Base or acccept a furlough if there are no other OBS positions in that Crew Base you are qualified for or wish to train for.
The OBS contracts have no provision/protection whatsoever. Amtrak is free to schedule staffing wherever they wish, and the OBS employees have to adapt accordingly.