Absolutely right - he/she will certainly be suspended or sacked (gross misconduct).
Quite right too (I'm a bus driver) - I would not subject my passengers to a game of "Chicken" with a train - only one loser, thats the bus.And passengers of course

The only case in the bus drivers favour is sudden brake failure, in which case he/she might not be at fault, but rigorous testing of the vehicle will no doubt be ongoing.
Time will tell I suppose.