Sorry if this is a bit radical for some on here, but I have long believed that TMs‡ and guards should be stripped of all responsibility for selling tickets.
The railways of Britain have long appeared to be reinventing themselves as airlines. Whether this has been a conscious movement or an accidental drift, it's obvious to even the most casual of observer. FGW▸ are in the forefront of this: you board an HST▸ with your hand luggage, sit in a cramped, high backed seat (some with a television screen at eye level in front of you), and listen to the safety announcements.
The message seems to be, trains aren't like buses - they are more like aeroplanes. That being (or possibly that boeing...) the case, tickets should and MUST be checked both before boarding and on arrival.
All stations should and must have ticket selling and checking facilities. Barriers should prevent access to train doors - if you haven't got a valid ticket, you don't get on - pure and simple. At locations where there are no permanent staff, stops should be longer so the arriving train's guard can make sure people get in and out of the barriers ok (again, just like happens on aeroplanes).
Journeys will take longer, of course. Tough. If given the choice between a slightly longer journey or being assumed by default to be a faredodging criminal lowlife, as ALL train passengers seem to be these days, I'm sure most reasonable people would vote for tighter controls and longer journey times.
On-board ticket sales belong to buses and coaches (though I think I'm right in saying even National Express coaches require tickets to be bought in advance?). In this day and age, NO tickets should be sold on board a train, and the train managers and guards should be primarily in charge of health, safety and security on board.
End of rant... sorry....
phil i am 100% behind you on this... how many times have you seen the guard make the effort to check tickets on a busy train only to get to the first group of people (normally late teens pretending to be 15 to get child fair so id's need checking then an argument insues) and by the time they have done that group were at the next station and half the train has got off ticket free greeted by no barriers, its not the guards fault im not even blaming fgw the fact that so many people do it eather by ignorence or cant be bothered to get a ticket,or know that there is a chance of a free ride and no punishment is worrying however penalty fair will solve it if enforced.. all guard should be doing is checking tickets issuing p'fs and the normal duties