Sub-Surface and Deep-Level, Overground.
London Underground S7 Stock (Bombardier, 2008-2017) and 1973 Stock (Metro-Cammell, 1974-1977) are seen at Stamford Brook station, operating on the District and Piccadilly Lines, respectively. The lines running parallel here, with Piccadilly Line trains running express, clearly illustrates the size difference between the Underground's deep-level lines compared to the sub-surface lines. Also notable is the track arrangement here at Stamford Brook, which consists of one side platform and one island platform - an uncommon arrangement on the Tube.
