The Duke’s history is so interesting it has a section of its own (see Menu above) but what you need to know here is that he is UNIQUE.
The Duke is a unique steam locomotive in the following ways: –
It is the only one of its Class (8P) built
It is the only double-chimney British Railways Standard Pacific (4-6-2) locomotive
It is the only British Railways Standard Pacific locomotive with Caprotti Valve Gear
It is the only British Railways Standard locomotive to be equipped with a 10-ton coal capacity tender (BR1E, later BR1J with steam powered coal pusher)
Of the 999 British Railways Standard class locomotives built it is the only one with 3 cylinders