Introduction
Despite the large and small tags, there was actually little difference between the two groups, the most crucial being larger boilers with an increase in tube heating surface. Cylinder and wheel dimensions were identical.
The class was originally designed by Peter Drummond, whose elder (and better known) brother Dugald had been in the company's locomotive department in earlier years and was at that time Chief Mechanical Engineer of the London and South Western Railway.
In appearance they were fairly typical Drummond family products with the stiffener across the cab roof. They were also inside cylindered, almost uniquely among HR bogie locomotives.
Read more about this topic: Highland Railway Ben Class
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