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John Rowland · January 11th 07, 01:03 PM posted to uk.transport.london

wrote:

BTW, I remember that there were advertisements between stations on
Berlin's U-Bahn that worked like a film. As the train passed each
frame, it created for passengers on board the illusion that there was
movement in the advertisement.

Are you sure? That would only work if the distance travelled by the train
between two flashes of the electric lights were exactly the same as the
distance between two successive images on the wall, which seems hard to
manage even once, never mind consistently.