It was built by Fletcher, Jennings & Co. and is one of the oldest locomotives still in active service.

It has a long wheelbase and the driving axle is behind the firebox in a layout similar to a Crampton locomotive.

[4] This prevents the use of a conventional valve gear layout which is driven from the rear axle.

[2] For most of the Railway's life, names were painted only on the North side of the locomotives.

Dolgoch returned to service in September 1945, with new displacement cylinder lubricators mounted on each side of the smokebox, a new chimney, repaired inner firebox and a retubed boiler.