[1] [2] 120 were built at Darlington Works and Armstrong Whitworth between 1913 and 1921 to the design of Vincent Raven, based on the NER Class T and T1 (LNER Q5).

One, 2238 (LNER 1946 number 3395; BR 63395) has survived to preservation on the North Yorkshire Moors Railway.

It is owned by the North Eastern Locomotive Preservation Group (NELPG), who purchased from Hughes Bolckow scrapyard in 1967, and was withdrawn from service in January 2017 to await boiler overhaul.

[4][5][6][7] In May 2023, 63395 suffered a cylinder failure while departing from Grosmont with a train, causing major damage.

[citation needed] Hornby has made a 1:76 (OO gauge) model of the class.