BR ex-Southern Railway 0-6-0 locomotive.
A mid 1960s photo of Q1 33015 & 33017 at Three Bridges loco shed. These locomotives were built during the war and were high power/low weight engines. To save materials they eliminated all unnecessary features such as boiler mounted running boards.

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