A magical sound: the clacking of the departures board – a “split-flap display” – as updated times and destinations scroll upward on the list. Sometimes the updates are a single row, sometimes the whole board erupts in fluttering cacophony of minutes and places and platforms.
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I’ll answer my own question: they’re “split-flap displays” and are, of course, a dying breed. Here’s video of the board in this shot: http://www.youtube.com/watch?v=XMqtcXTPZyI