I don’t think people need to be told trains can’t pass red signals.
It may be hard for many on this forum to believe, but I think (well, I know) a great deal of passengers believe that train drivers have a lot more leeway than they actually do. Most people have literally zero knowledge of the concepts of a Rule Book, operating irregularities, SPADs, "safety critical" duties, dispatch, and more - even many regular commuters who've spent decades ignoring anything which happens more than three inches away from their newspaper.
And why shouldn't they ignore stuff? They're passengers. Their focus is on whatever reason they need to get from A to B. They might want to sit down on the way. They probably want the train to be at the right temperature and have a toilet. They might want a drink and a chocolate bar. That's basically it. The signals could be pink with green spots on them, and the train could float sideways on a magic jelly cushion. (I never get a unit with a jelly cushion mod.)
I've seen many passengers ask the conductor why they're not at the front driving, because once they went on the DLR, and look, the same bloke/lady in a uniform can do all the stuff... and a bus driver sells tickets and stuff, so a train driver... same, huh?
Some people complain on Twitter that the train is overtaking another train and that it's dangerous (I remember a case of particularly clever use of bidirectional signalling on the GEML which resulted in a stack of complaints).
I remember one person screenshotting a speedo app on their phone and copying in news outlets because they thought there was no way a train should be doing 83 mph in a residential area (and it was 2 mph under linespeed).
I have had numerous people tell me, quite confidently, that there are
always signals at the ends of station platforms and
never anywhere else. I remember at least one or two threads on this very forum asking whether or not signals only clear when the train is due to leave the platform.
Many people, if driving a car, would question why they were being held at a red traffic light for 2 or 3 minutes at a clear and empty junction at 3am (indeed I did that myself today, as did the adjacent bus driver). Anyone who would sit there for 10 minutes, with nothing whatsoever going on (unless you're in an area with red light cameras), would be deemed a bit silly by a lot of people. That debate is obviously best taken elsewhere.
And yet the railway has multitudes of reasons why skipping that red light is a really terribly catastrophically awful idea unless you have permission and you've agreed the specifics right down to the number of the signal. I can't remember the last time I reported a traffic light by its signal number.
So people who don't, won't or can't know about those multitudes of actually reasons will assume that, in fact, the train driver could probably do something about it, if indeed it's even true that they put signals between stations, because why would they? 'Cos everyone knows there's no reason a train could ever need to be stopped between stations anyway.
And then after 10 minutes they'll look at the nice gravel path down to a gate by a main road, and there's a big green emergency exit handle. "I once had to pull an emergency exit handle in Ikea", they say. "It said £50 penalty and danger of death", they say, "but it actually just ended up on the car park ramp".
"So surely the train track ain't any more dangerous..."
CRACKLE... "This is an emergency call..."