North End of Ampthill Tunnel in 1954/1955.
One of many Southbound coal trains from Toton in Nottingham to Brent in North London.
Being hauled by BR 2-10-0. Class 9F. No.92025 - an experimental 9F fitted with a Franco-Crosti boiler.
Reproduced here with the kind permission of the copyright owner Ray Wardleworth.