This 5 ton 60hp Motor Rail "Simplex" 4wDM (Builder's number 60s353 of 1968) was built to 2ft 0 1/8ins gauge for use by glass manufacturers Pilkingtons for sand extraction operations in southern Lancashire.
With two other "Simplex" locomotives used by Pilkingtons, Katherine arrived on the WHR(P) on 14 December 1981. Being in the "best" condition it was the first "Simplex" to be returned to traffic. It was painted red and the engine overhauled. The wheels were not regauged. With the improved track at Gelert's Farm Works the Loco was withdrawn from traffic and is now undergoing a major rebuild.
See The WHRL site for more information.