King William Street was a short-lived northern terminus on the City & South London Railway, a predecessor to the Northern Line on the London Underground. It was in the City of London, on King William Street, near the present Bank and Monument stations.
It was opened in 1890. Due to the platform facing east-west and the steep curves and the steep tunnels in the approaching tunnel, when the line was extended northwards to Moorgate and, it was decided to abandon the station, building a new one at Bank. It closed in 1900.
After the line closure, the original tunnels were permanently sealed, to prevent water coming in from the Thames. When the Jubilee Line Extension was built, in the late 1990s, the original southbound tunnel was destroyed in order to upgrade London Bridge station. Photographs of the original tunnels, including their use as an air-raid shelter during World War II can be seen on the London's Abandoned Tube Stations guide page, linked below.
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