Some guards I know are lenient with respect to selling off peak tickets, but have zero tolerance towards those who refuse to pay. If they're also rude then that's it, train won't move until they're off. Known guards to throw said people's bags off the train. Then again, I've known some guards to get bottled so it's a risky game.
IMO one can't be faint hearted in such a job otherwise the company is just going to lose money.
That is indeed a very risky game, and I would be very surprised if anybody behaving in that way got an ounce of support from their TOC in this day and age. Putting yourself directly in the path of conflict with provocative actions like that will get you no sympathy from the management, if anything they're likely to do their level best to get rid of you.
As for refusing to move or let people alight from the train, it's an ever present bugbear for TOCs that some staff, no matter how may times they are told, just cannot grasp that it is unacceptable, and continue to cause regular headaches by chasing 'dodgers over a few quid to the abandonment of all other responsibility. On top of the issues of delayed trains, inconvenience to other passengers and the likelihood of your 'trapped' scroat getting physical, Guards have ended up being interviewed by the Police for refusing to allow people off a train in a platform, on the grounds of false imprisonment
You can't really do most public-facing jobs if your faint hearted I'd say, but regardless of your attitude the TOCs make it clear that their preferred approach is to sell the easy tickets and leave the rest well alone!
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I paid my fare (50p) but he then said that he had to go to the back of the train to do the doors. Yet I knew he could do them from the front. In total he delayed the train by about 3 minutes. He obviously didn't realise I was in the know. Surely the guard was breaking the rules by delaying the train over revenue?
On some Class 150 stock there is a DKS only at either end of the unit and fitted actually inside the cab itself. It's possible that for whatever reason, rule or preference, he didn't want to enter the leading cab. Or it could have been a simple operating fault with a certain panel. But yes, delaying it to sell a 50p ticket (or any ticket, save perhaps an All Line Rover!) would nowadays equal a bollocking.