They passed to the London and North Eastern Railway at the 1923 grouping and received the classification B1.

[1] They were built with a saturated boiler, inside slide valves and Stephenson valve gear, two outside cylinders connected to 6-foot-9-inch (2.057 m) diameter driving wheels.

[3] The two locomotives were renumbered by the LNER by adding 5000 to their GCR numbers; and classified as B1.

[4] 5195 received a Diagram 16 boiler in March 1926; while 5196 received its new boiler and had its cylinder diameter increased to 21-inches in April 1927[5] Their classification was changed to B18 in April 1943 to allow Thompson's B class to be reclassified as B1.

This article relating to steam locomotives operated in England is a stub.