"Mizter T" wrote in message
...

Almost every EMT train I get to St Pancras seem to have a red hexagonal
"not to be moved" sign attached above the driver's door as soon as it
arrives.

A regular feature of intercity trains at London terminals (and at the
other ends as well I think), the meaning of which I've idly pondered
many a time but never definitively deciphered.

In that context it could simply mean 'don't go until we've finished
disconnecting the water hoses from the train'?

Paul S