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TIL: You can open the doors and move between the cars of the Tube. 😮
@KevinMarks isn't that the London Overground though?
@bascht Circle , District, Hammersmith and City have them (the older lines with bigger tunnels)
@KevinMarks ooh, neat! I've been mostly around Jubilee and Victoria lines this week.
@bascht on some of the newer carriages there aren't doors, just a continuous corridor.