Named after the ancient 12th century Knights Hospitaller preceptory Dinmore Manor in Herefordshire, the locomotive was built to a Great Western Railway design by British Railways in the ex-Great Western Works at Swindon in 1950, and was initially based at Oswestry.

It was withdrawn from service in November 1965 from Shrewsbury, having been the last of its class to run with BR, and moved to Woodham Brothers scrapyard in Barry, Vale of Glamorgan, South Wales.

[2] The engine then made its debut on the West Somerset Railway over the summer of 1995, and ran there for nearly 9 years.

This was completed in April 2014, and Dinmore Manor subsequently entered service at its new base at the Gloucestershire Warwickshire Railway.

The locomotive was withdrawn from service at the Gloucestershire Warwickshire Railway in January 2025 following the expiry of its boiler certificate.