Leading edge technology of its time.
Sir Nigel Gresley was the designer of the A4 Pacific Class Locomotive.
The A4 Pacific Mallard still holds the world speed record of 125mph created on 3rd July 1938.
The A4 Pacifics cut the journey time between London and Newcastle down to 4 hours (from 5 days by horse and cart 🙂 . The coal tender had a walk through passage so that drivers could be changed without having to stop the train.
These pictures were taken at the North Yorkshire Moors Railway which still operates the Sir Nigel Gresley.