The first four (Nos 75 to 78) were built by Hawthorn Leslie and Company on Tyneside, and the maker's plates bore the date 1917, but because of wartime delays were not delivered until 1918.

[2] They featured two Robinson type 20+1⁄2 by 26 in (521 by 660 mm) cylinders outside (with long tail-rods), 5 ft 3 in (1.6 m) driving wheel and a boiler set at 175 lbf/in2 (1.21 MPa).

Locomotive weight was 56 long tons 9 cwt (126,400 lb or 57.4 t).

All eight entered service with the London, Midland and Scottish Railway (LMS) in January 1923.

[3] This article relating to steam locomotives operated in Scotland is a stub.