London Transport District Line train - latterly known as Q stock.
These sets consisted of a mixture of G driving cars, M and N trailers and Q38 drivers and trailers (the latter are bell shaped and similar to the O and P stock which worked on the Metropolitan, Circle and Hammersmith lines).This train has a G driving car leading and at least 1 Q38 car. The train is entering Ravenscourt Park from Hammersmith and is heading for Ealing Broadway). In the background a Piccadilly line train formed of pre -1938 tube stock has just emerged from below ground.

Scan by Michael Taylor, Hamilton, Ontario, Canada. (www.michaeltaylor.ca)
Photo copyright by Keith Harwood