An old 1957 Film showed last Saturday on TPTV called ‘The Secret Place’, featured much on-location footage in the East End of London. Numerous views showed the Great Eastern Main Line between, I guess, Bethnal Green and Stratford on the continuous viaduct, complete with original DC Overhead infrastructure. In one scene, behind the actors could clearly be seen passing, a 9 car 306 formation, complete with its diamond pantograph, on each leading motor coach of the 3 DC units as built! Incidentally, in other on-street footage could be seen much Trolleybuses overhead wiring plus, an occasional brief glimpse of Trolleybus vehicles themselves.