They were a part of the Railway Operating Division during World War 1.

[2] The class acquired the nickname "Pom-Poms" due to the similarity of their exhaust noise to that of the "Pom-Pom" quick-firing gun used in the South African War.

[3] They passed to the London and North Eastern Railway (LNER) in 1923.

The LNER classified them as J11 with sub-classes J11/1 to J11/5 because of detail differences.

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