Snow Hill tunnel (London)

Snow Hill tunnel was constructed by the London, Chatham and Dover Railway (LC&DR) to connect its line from Herne Hill to 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 a number of main line railway companies to run cross-London passenger and goods services.

The eastward curve also connected to an extensive Great Western Railway goods station beneath Smithfield market (now a car park).

Snow Hill station closed in 1916, although the tunnel remained in use for goods traffic until the end of the 1960s.