Boltar wrote:
could see, on platforms. Even at the terminus, if you fail to
alight, they take you into the reversing siding for a few minutes
before starting the return journey.

The HSE would be wetting their nappies over that if it happened
here. Don't forget on the tube we have to have the farce of a
driver walking down the train checking its empty and closing each
carriage one by one before he takes it out of service.

That's because the car-end doors can be opened by passengers. On Line
14 in Paris, there are full-width gangways between cars, so there's no
risk of a passenger getting on to the track. (And on other lines with
older stock, it needs the Métro equivalent of a J-door key to open the
car-end doors.)
--
Richard J.
(to e-mail me, swap uk and yon in address)