History
The station was originally opened in November 1901 by the first deep-level tube railway, the City & South London Railway, as part of an extension of its line from Moorgate to Angel. The Northern City Line platforms were opened in February 1904 by the Great Northern & City Railway which built its tunnels to a larger diameter capable of accommodating main line trains in the hope of carrying trains from its northern terminus at the Great Northern Railway's Finsbury Park station to Moorgate. This eventually happened in the 1970s, with the line becoming a BR route, with through services to Hertford and Welwyn Garden City. During the 1920s the station was rebuilt when escalators (1 & 2) replaced the lift shaft in accessing the platform tunnels. Between 1967 and 1969 the station was once again modified, the surface building was replaced with the current sub-surface structure situated in the centre of the roundabout and an additional escalator shaft (3) was added. During the 1990s the effects of corrosion caused by excessive soil acidity required a section of the cast iron running tunnel lining in the Northern Line, south of Old Street, to be re-lined with stainless steel tunnel segments.
Read more about this topic: Old Street Station
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