I've often wondered whether people intending to defraud the railway simply buy a ticket from, say, Birmingham to Coventry, and then claim to have fallen asleep when challenged for their ticket half way to London! Do the railway authorities actually "send" people back or do they just allow them to leg it out of the station? Surely claiming over-carry must be the easiest ruse to avoid penalty fares etc?
As I've mentioned in an earlier post, I lost count of the number of times I did a ticket check after leaving KX and found passengers holding Peterborough tickets when it was first stop York, or heading Southbound and doing a check after York and finding passengers with Doncaster tickets when it was next stop London. Obviously, there were quite a few who were visibly distressed or annoyed with themselves (or me for some reason) for not checking, and I suitably endorsed their tickets to get them back. However, their were also quite a few who didn't seem to be that bothered at the prospect of making an extra 200 mile round trip, and sometimes there were a few clues. A suitcase and bags in the rack above their head for a shortish journey to Donny, or a distinct Yorkshire accent instead of a Cambridgeshire one when they were supposedly only heading North to Peterborough. So, I'm sure quite a few were 'at it'. The thing is, you couldn't outright accuse them of deliberately wanting to be overcarried, so you just endorsed their ticket for the next train, knowing that they would probably toss it in the bin as they legged it out of the station. Remember, this was GNER days before the barriers were brought in and station staff obviously did not have the time to escort people to the next train and wait around to ensure they boarded it.
What discouraged me somewhat as a train guard was that if you found someone without a ticket, they could just buy a ticket from you without any fear of a penalty, so it was always worth it to them to try and chance it that there wouldn't be a ticket check. While on the continent, it's normally been a case of if you join a train without a ticket, you have to actively seek out the conductor to buy a ticket to try and avoid a penalty. If he or she found you while doing a ticket check, it would be the price of the ticket plus a fine. I found that out in Italy once when my FIP ticket was apparently not valid for that particular train. The guy took no prisoners and made me pay the full fare plus a fine on top, and wasn't bothered that I had made a mistake or that I was also a conductor (guard) in the UK. So much for helping out fellow railway staff.
Just to go off topic a bit (though you might find it interesting), on my long weekends off from the railway, I sometimes used to drive the overnight Eurolines coach service from London Victoria to Amsterdam. One Saturday night, I was in Amsterdam and preparing to drive the overnight back to London. It was quite busy with several coaches boarding and the Amsterdam staff were checking tickets while I loaded the luggage. There was a dupe service covering my intermediate stops at Utrecht and Eindhoven, so I was direct to London only via the ferry at Calais. My coach was nearly full and I made a pre departure announcement welcoming passengers to the London service. We got to Calais around 3am where passengers had to get off to go through passport control. As they were getting off, an Asian female passenger in her 40's came up to me and in halting English asked me when we would be getting to Berlin as she was concerned that we now seemed to be at a ferry port. She went into mild shock when I gently explained to her that we were heading for London and not Berlin, backing up my information by pointing to the illuminated dot matrix destination sign in the windscreen clearly showing London.
It seems that the Amsterdam staff had somehow messed up and allowed her to board my coach when she should've boarded the German coach that was parked next to me. What was I to do with her? I couldn't leave her to the mercy of a cold Calais port in the middle of the night. Luckily, she had a German passport with her so I suggested that she continue to London and re arrange with Eurolines to get her to Berlin from there. So that's what we did. Luckily, she made it through passport control and I escorted her up to the lounge on the ferry, making sure she knew how to find the coach again. Then when we got to Victoria at 8am, I parked the coach up in a corner of the arrivals shed and escorted her across the road to departures and the Eurolines desk. Hopefully, she got to Berlin in the end after her unexpected side trip to London.