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QUOTE (Edwin @ 3 Nov 2008, 09:26) <{POST_SNAPBACK}>Looks like the door interlock light as fitted to all sliding door stock since time immemorial. It lights up orange when a door is open on that coach. If the guard tries to close the doors and can't get the interlock circuit to say they are all closed then this is a way for train/platform staff to find the problem more quickly.

It is always in the centre of the bodyside. I'm not aware of anything similar close to the doors, can you post a photo of this feature as I think it must be something else.

They are the door open warning lights, but I'd not describe them being fitted since "...time immemorial" as they were never used on main line slam door stock.

London Transport and its predecessor companies have used sliding door stock since the early 1900s but without external door open warning lights. They only started using the warning lights in 1949 with the District line R49 stock. London Transport never fitted door warning lights to their slam door T stock.

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