People should understand that door interlocks will detect most obstructions but for reliability reasons might not be sufficiently sensitive to detect a hand. However, should a door close on a hand the rubber seals are sufficiently flexible to enable it to be withdrawn with relative ease. Mind you if the hand is holding a briefcase (which is inside the train) then hand and briefcase may have to part company in these circumstances. A secondary check on whether or not it is safe to depart presumeably involves the driver checking to ensure there is nobody standing inside the yellow line. At the end of the day passengers should act responsibly and take cognisance of their own safety.
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