British Industrial Narrow Gauge.
The Bowaters Paper Plant at Sittingbourne, Kent was and still is home to a large fleet of narrow gauge steam locomotives. This is locomotive "Triumph" a 1934 Bagnall 0-6-2T seen working on June 21st, 1965 prior to preservation.

Photo by Ray Soper, Brampton, Ontario, Canada. (Ray Soper)

Scan by Michael Taylor www.MichaelTaylor.ca