The Kingsway Tramway Subway is a cut-and-cover Grade II Listed tunnel in central London, built by the London County Council, and the only one of its kind in Britain. The decision in 1898 to clear slum districts in the Holborn area provided an opportunity to use the new streets for a tramway connecting the lines in the north and south. Following the pattern of tramways in New York (the Murray Hill Tunnel) and Boston (the MBTA Green Line), it was decided to build this as an underground connection.