This vintage railway film, commissioned by British Railways in 1968, documents the technical triumph of rebuilding a bridge while trains continue over it and boats travel underneath requires deepsea divers, cofferdams and overloaded barges no mean feat.
Grosvenor Bridge between Battersea and Pimlico was originally known as Victoria Railway Bridge, and in 1968 it was said to be the busiest railway bridge in the world, with 1000 trains crossing it every day.