On Apr 3, 8:06 pm, Tristan Miller
wrote:
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?

The odd thing is that often one will see a passenger - often a tourist-
type but occasionally a commuter-type looking person - who presses the
Open Door button. I imagine these freaks going to work with a huge
feeling of euphoria: "I helped out all those people!"