Granted you can't do it these days as most trains have sliding doors you can't open yourself. But to illustrate my point, if you were on the fast Weymouth to Waterloo express and you wanted to get off at Woking, you could pull the chain just as soon as you saw the line from Guildford feed in from the right. With the emergency brakes applied the train would slow from 90 mph to stop at the platforms of Woking station some mile and a quarter down the line. Apparently (as I never tried it).
Then if you were a quick runner you could hot foot it out of the station, with the exit ticket barrier staff none the wiser.
Of course you had to have a valid ticket for this to work lol
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