Snow Hill Tunnel is a railway tunnel on the northern edge of the City of London between City Thameslink and Farringdon stations. The tunnel runs beneath the Smithfield meat market and was constructed using the cut and cover method immediately prior to the building of the market. The tunnel opened on 1 January 1866.
Snow Hill tunnel was constructed by the London, Chatham and Dover Railway (LC&DR) to connect its tracks from the Ludgate Viaduct to those of the recently opened Metropolitan Railway's Widened Lines south of Farringdon station. To the north-west, the Widened Lines in turn connected to the tracks of the Great Northern Railway at King's Cross and the Midland Railway at St Pancras via tunnels running beneath the two main line termini. Snow Hill tunnel thus provided the crucial link in the only north-south railway route through central London, enabling cross London passenger and goods services to be run by a number of main line railway companies.
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