Classic Features
Features that arrived during the 1860s and stayed until the Peter Drummond days were the louvered chimneys and counter-pressure brake.
The chimney was really a pair of concentric ones. It is usually considered to have been adopted to aid forward visibility for the driver (a rather different pattern of smoke deflector), but there is some evidence that the real reason was to reduce the chance of lineside fires (rather like the prominent 'stacks' of early USA designs).
Read more about this topic: Highland Railway Classes Prior To 1870
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