LNER Class W1

Common card · No. 452233

The LNER W1 No. 10000 (also known as the Hush-Hush due to its secrecy) was a one-off experimental steam locomotive fitted with a high pressure water-tube boiler. Nigel Gresley was impressed by the results of using high-pressure steam in marine applications and so in 1924 he approached Harold Yarrow of shipyard and boilermakers Yarrow & Company of Glasgow to design a suitable boiler for a railway locomotive, based on Yarrow's design. In active service, the locomotive did not fully meet expectations, and no further examples of the class were built.

Read on Wikipedia · Image Andy Dingley (scanner), Public domain