Hither Green depot and at least 4 class 73's and a pair of class 33's are visible.
The identifiable locomotives are from L-R 73116, 73129 and 73115.
Date taken unknown, but prior to 16/1/82 when 73115 was written off in an accident,
http://andygibbs.zenfolio.com/p103993087/hc3b7297#hc3b7297Will take you to an image of the collision.
Photographer unknown.