Train Vs Hand.....

[mushroom25]

earlier this month a passenger's hand was trapped in a train door, and the passenger ended up being dragged along the platform
https://www.bbc.com/news/uk-england-london-60180691

on lifts, if something is trapped in the doors, they automatically open. should the same apply to train doors?

[Teapots1]

I'm sure they will be looking into it, to avoid this happening again.

[andy-hughes]

More importantly, there should be a cut-off switch to stop power to the train, so it doesn't gather speed leaving the platform dragging something, or someone, along with it.

[bhg481]

It should be very simple. Our Volvo won't lock if a door is not closed properly, so cutting off the controls to start a train should be equally simple.

[Canary42]

The answer to the OP is that there is - it just failed to operate on this occasion.

[Jonathan-Joe]

Train doors do detect objects trapped. But the more sensitive this is, the greater the chance of delay as passengers try to board when doors are closing. Trains give visual and audible warnings that doors are closing.
The majority of accidents similar to that described are caused by passengers ignoring warnings and deliberately forcing doors open.

[mushroom25]

// The answer to the OP is that there is //

errr, no there isn't. at present it relies on the vigilance of the driver or the guard to spot if there's any issue with starting the train. at this time, if you were to put your hand in a closing train door, it will trap you.

[webbo3]

\\It is understood the woman's hand got caught in a closing door and the train started to slowly pull off, //

Sounds like she thought she was late and thought the door would open if she put her hand in it.

[Canary42]

Well there always used to be in the days when I regularly used the trains, so presumably it has been discontinued in the cause of profits before people.

[mushroom25]

// Train doors do detect objects trapped. //

very few trains in service today have this facility, the most notable being on the Victoria Line, where (as you say) constant delays resulted in the sensitivity being turned down.

[mushroom25]

many trains have these markings to highlight the point...
https://mobile.twitter.com/mwichary/status/1081067202747351046