British Railways Class 401 EMU.
A mid 1960s photo of unit 2086 at Horsted Keynes with a working to Seaford. This passenger service was abandoned in the mid 1960s and Horsted Keynes station is now an intermediate stop on the Bluebell Railway.

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