I'm sure I've seen a few signs here and there on platforms to tell the train crew which side to open the doors on but can't for the life of me remember where now.
I think there is one of these signs at Preston Park, just north of Brighton. It's the only station until Hayward's Heath to have more than two platforms, so drivers will be used to opening doors on the left side. The same problem should happen at Hove, but I don't think there are any signs there.
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I think the only case where both sides are opened are on the DLR at Tower Gateway, but I can't remember if here the one side opens, then closes, before the other side opens for boarding passengers, despite the fact I've been there and been on it!
Having passengers alight one side and board the other should counter any dwell time concerns at busy stations - the driver/guard can check and close the exit doors while passengers would be entering them if only one set of doors were open. Then they can switch to the entry doors.
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going a little off track, but using cameras/monitors (albeit a rather large bank) it should be possible to see both sides of the train at once- though the number of moniotrs required for both sides of a 12 car train would be bewildering.
Going slightly off-topic, but I've never really understood the 'check clear before door close' argument. Thinking about 377s:
* The doors take a while to close. Plenty of time for a passenger to run from out of sight to get stuck in the door.
* The doors automatically close on a timer anyway (at a terminus), so no one is checking they are clear when that happens
* Automatic doors are clever enough to know when something is blocking them and not push too hard.
* At a busy station there may be a constant stream of passengers arriving on the platform, so no good time to close the doors.
Sure, have a check once the doors have closed and before moving, but that doesn't need to be both sides at once.
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It's exactly this kind of substitution and mistake that could cost lives or cause serious injury by placing a manager with a map in charge of a train. Heaven forbid the train needed emergency rescue at night and the driver has been incapacitated.
So what is the chance and impact of this happening and someone being injured, vs. the train not running meaning hospital staff can't get to work so a hospital is left short staffed?