No offence but have you actually worked a train??? have you had to deal with persons like Mr Main on a reasonably Regular basis when you and the Driver are the only 2 railway employees? how do you think the Conductor felt, I know I would have felt threatened by his behaviour and so would most, We cannot rely on the police due to lack of numbers, we are in a metal tube and the majority of the time we are by ourselves dealing with persons like Mr Main, The conductor involved would not have stood a chance if Mr Main was physically aggressive, good on Mr Pollock for what he did.
But he wasn't "physically aggressive" was he? So where was the justification to manhandle him like that?
Tell me how your job is made easier by prompting someone to precipitate a full scale fight?