A British Railways diesel locomotive with expres train, 1960s.

Photograph by Bishop Eric Treacy, of a Type 4 locomotive (later known as a Clas 40) at Dillicar, Cumbria, on the West Coast Main Line from England to Scotland. Treacy (1907-1978) was often allowed special acces to areas denied to many railway photographers. He also befriended many of the footplate crews, occasionally persuading them to create special smoke effects for the camera.