I can't find any photos now but LA and a lot of other cities have a strip running all the way along both side walls, like this:
>>> Station Name >>> Direction/Terminus >>>
showing you the current station, the direction of the train and (by arrows) the direction you need to go to exit the station. As soon as you get off the train, you know which way to walk. It's only a simple thing but it makes life much easier and, in busy stations, much faster.
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