The thing is you have to be vigilant for speed limits, signals, even though you get a buzzer or gong when approaching them, then there is a pedal to push every minute to stop the brake being applied, you may have trespassers , animals,vehicles on the line ahead, even broken down trains, fouling your line.
There is also no desk to rest your paper on,ontrain monitoring, to check your speed and how you drive, along with forward facing cctv.
Nobody to talk to, and no radio,or mobile phone,although sometimes they do get through the door.