It's certainly not 'fairly regular' behaviour for passengers to decide they can't be bothered to wait for a few minutes at a signal stop.
There have been repeated incidents in and around London where passengers have let themselves off trains that have stopped due to operational incidents. It happened three times during one single operational incident at London Bridge earlier this year.
There is no consensus how long that train was actually at a stand- FGW say a few minutes, some of the passengers say significantly longer- and that partly misses the point anyway. If a number of passengers are panicking then even a fairly short stop will seem like a very long time. I suspect it was more than a "few minutes" for people, no matter how drunk, to be shouting to be let off the train.
These types of incidents keep happening. I don't think FGW could have done a great deal differently; I think the train should have been held in the station with the doors open, and I think the delays should have been apparent, but if the guard didn't know about the delays I can understand why it wasn't. "Stick more carriages" isn't an option, and nor is running more frequent trains.
BestWestern said:
So there would have been a very severe delay whilst awaiting police assistance and for them to persuade rowdy rebelious yobs to do as they were told.
I rather fear you're missing the point.
The consequences of letting that train leave and sit at a red signal 200 yards down the track were that passengers panicked, let themselves off the train and walked back to the station down the track. There was a severe delay anyway. And on top of the delay the safety of passengers and staff was compromised because of what happened.
To be blunt, if the train is in the station the only thing that people are losing is money. Another poster further up pointed out that if the train stays in the station then FGW foot the bill, if it moves 200 yards up the track someone else foots the bill. It's clear the motivation is to move the train away from a place of safety to pass the costs on to someone else in the industry.
Move the train in this sort of situation and you get passengers letting themselves off, putting everyone in far more risk. I'd rather have the BTP come along to evict a few people from a train than have the BTP come along to scrape them up off the track.
We saw the same thing after a major signalling failure at London Bridge, trains were still despatched from nearby stations only to sit for ages 300 yards up the track. One train took over two hours to get from South Bermondsey to London Bridge. It's precious little wonder people got up and let themselves out. I've seen the same thing on East Coast, my full-and-standing bank holiday Friday train being despatched from Peterborough despite a known complete signal failure a couple of miles up the line. There's no need for it, it just causes more problems.
We can wibble about "yobbos" all day long if we want, but I think that's also missing the point. Panicking crowds do not act rationally and do not act sensibly, that much is a fact and is taken into account when doing appropriate crowd management. Crowds are more likely to panic if they're under the influence of drink or drugs (not that we know these passengers were, you're just guessing based on their age).
The signs are that the industry seem very slow to understand what makes groups of passengers let themselves off trains. The industry seems stuck at the casting blame stage, rather than making strategic attempts to prevent it. The issue here, as always, is communication. The guard and driver didn't know about the delays on the other train so they moved the train from a place of safety; the passengers didn't know what was going on so they panicked and let themselves off.
The same communication issues keep getting repeated- Kentish Town is the most famous example, but the incidents at London Bridge earlier in the year are just as telling- and instead of acknowledge failings everyone seems determined to wibble about those nasty students being thuggish yobbos (and other than a bit of swearing there seems little evidence they were thuggish).