31-717 LNER B1 1264 LNER Lined Green

The London and North Eastern Railway (LNER) Thompson B1 is a class of steam locomotive designed for medium mixed traffic work. Designed by Edward Thompson, it was the LNER's equivalent of the highly successful GWR Hall Class and the LMS Stanier Black Five, two-cylinder mixed traffic 4-6-0s. However, it had the additional requirement of having to be cheap because, due to wartime and post-war economies, the LNER was short of money.