The Kingsway Tramway Subway was a cut-and-cover tunnel in central London, built by the London County Council. Services opened to the public on 24 February 1906 from The Angel, Islington to Aldwych, with a ceremonial opening by the chairman of the Highways Committee. Special trams were constructed from non-flammable materials for the route, and wooden trams, common on other routes, were not permitted through the subway.

In the parliamentary session of 1905 plans were submitted for an additional station at the south end of the tunnel, under Wellington Street. The opening of the new tramway along the Embankment meant it was decided to link up with this route instead and the station was never built. A new sharp curve was built under Lancaster Place to enable an exit through the western side wall of Waterloo Bridge and a triangular junction with the through line was constructed. The eastern side of this junction, leading to Blackfriars, was removed as part of the 1930s upgrade.

Trams in London were abandoned in London on 5 July 1952, after which street tracks were lifted, but those in the subway mostly remain in place. In 1953 London Transport used the tramway to store 120 unused buses and coaches in case they were needed for the Coronation but proposals to convert the tramway subway to a car park or a film studio failed and it was leased out as a storage facility from October 1957.

In June 1958 the London County Council proposed making use of the tunnel for light traffic coming from Waterloo Bridge in order to reduce traffic congestion at its junction with Strand, and in April 1962 that the go-ahead was given for part of the southern end of the subway to be used in this way. Construction began that September and it opened to road traffic as the Strand Underpass on 21 January 1964.

Source Wikipedia

There isnt really much to talk about with this one. Its a tunnel, it goes underground, theres nothing in it anymore bar some old film prop posters. Thats it, enjoy.