Sadly that no longer appears to be the case. So much so that one TOC was prosecuting a member of rail staff, alleging that the rail staff member was misusing their PRIV boxes when they were about 10 years old, madness. That was settled out of court, but the threat from some TOCs is very real and innocent customers, even rail staff, are considered fair game by some TOCs these days.
When you say "fair game" what do you mean ?
If someone passes through a station and boards a train when there was ample opportunity to pay then I would class the TOCs actions as being well and truly properly if indeed somewhat belatedly applied.
We read many tales on here from people who "find" themselves in trouble, but of course this is always one side of the argument. It is a shame that both sides of the argument are not heard as I can reel off occasions where a passenger's tale appears to be so truly awful that one would immediately seek out and sack the staff on the spot but upon hearing the whole tale, a far different story emerges - usually one which is far different and not so favourable to the complainant.
Whenever I travel on a Railway outside of the UK I go to the "trouble" of establishing how to purchase a ticket so as that I do not fall foul of the TTIs or the travel conditions.
Simples as the advert says.
It is not rocket science yet there seems to be this attitude within the UK that this is unecessary or not something that people need to bother about. A situation fuelled and certainly not helped by some of the emotional hand-wringing and emotionally charged responses we see on here, when those who try it on are called to account.
.....(of course the usual questions about if the OP is being 100% accurate come up).
And THAT of course is where the Devil is....in the detail we do not have.
There are many questions which arise from the original story and many things that do not add up.
As I said earlier if EVERY TOC Prosecuted every Byelaw offence then the Magistrates Courts would be filled.