Greetings.

What is the purpose of the "open" buttons on the doors of the London
Underground carriages? On every Underground train I've used, the doors
open automatically at every station. Is/was there a time or place where
they don't open automatically and the buttons must be used?

Regards,
Tristan

--
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_V.-o Tristan Miller [en,(fr,de,ia)] Space is limited
/ |`-' -=-=-=-=-=-=-=-=-=-=-=-=-=-=-= In a haiku, so it's hard
(7_\\ http://www.nothingisreal.com/ To finish what you