Liverpool Street and Norwich Line

Trowse Bridge is a single-track railway bridge which carries the Great Eastern Main Line over the River Wensum just outside Norwich in England at grid reference TG245076.

The bridge was originally built in 1845 by George Parker Bidder, was rebuilt in 1905 and again in 1987. Like many swing bridges, the structure first lifts on hydraulic jacks before swinging open to allow the passage of water traffic. The bridge has frequently caused problems with navigation on the river due to its unreliability, leaving it unable to open.It is notable for being the only swing bridge in the United Kingdom to carry an overhead electrified railway track.

Source: Wikipedia