Something I only just realised, having never really given the matter much thought, is that a lot of night scenes in films, both colour and black and white were and are actually filmed in daytime. With a blue filter to darken the sky and the film underexposed by a couple of stops or nowadays manipulated digitally. This was as a result of watching an interview with Walter Lassally the cameraman on the early Woodfall films up to and including "Tom Jones".
What's further interesting about this (no falling asleep at the back there) is that "Brief Encounter" was shot at Denham Studios. However the station chosen for the location shots was Carnforth in Cumbria because the South of England was all still subject to blackout restrictions which would have prevented night shooting whereas Cumbria was not. But why didn't they simply use day for night at a more southerly station? The story needed a train to stop but no particular train and they could have switched on the platform lights. Questions, questions.
michael adams
...