Invention and Engineering
The GWR 0-4-0ST steam locomotives were acquired by the Great Western Railway at the 1923 grouping. They came from small railways (mostly in South Wales) and from contractors. Some of them survived into British Railways ownership in 1948 and a few are preserved.
Difference engine.
GWR 7800 Class 7820 Dinmore Manor.
Text from Wikipedia; plate via Wikimedia Commons. Text CC BY-SA 4.0; plate freely licensed (see Commons). Source record. Images and catalogue data are reproduced from open-access collections.