 They both passed to the Great Western Railway (GWR) in July 1922, which assigned them to Diagram A114 and renumbered them 2194 "Kidwelly" and 2195 "Cwm Mawr".They were sent to Swindon for overhaul in July 1923 and November 1922, but did not return to traffic until February 1926.The rebuilds were shown on Diagram B22; virtually new boilers (GWR code YF) were provided, and the bunkers were extended.