'Caerphilly Castle' 4-6-0 locomotive, 1923.
© National Railway Museum / Science & Society Picture Library -- All rights reserved
This locomotive was designed by C B Collett for the Great Western Railway and built at the Swindon works. At that time it was the most powerful locomotive in the country in terms of calculated tractive effort, with its power output measuring 31,626lb. It was withdrawn from service in 1960 having covered 1,910,630 miles. It is shown here in the former land Transport Gallery at the Science Museum in London (1966-1996).