Design
The 040 were of simple expansion with two cylinders and possessed a Crampton firebox and Walschaërts type valve gear. There were variants in cabs and several open cabs, others, closed. The water tanks on each side of the firebox possessed a sloping front and gave the driver additional vision and permitted him to see if workmen were on the track in front of the engine.
A replacement for the 040 was difficult to design as diesel transmission could not cope with slow and long starts.
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