This loco was supplied new to Guest, Keen & Baldwin Iron & Steel Company for use at their Pantmawr limestone quarries, South Connelly, being delivered on 7/5/46. Limestone is an important flux used in steelmaking, and the quarries supplied the huge works at Margam and East Moors. The company changed its name to the Steel Company of Wales in 1947. Between 1947 and 1953, the loco was sold to the Derbyshire Silica Firebrick (DSF) Company at the Friden works in the Peak District where it worked alongside Ruston & Hornsby 191658 of 1938 (MRT fleet No. 99). Friden works is at Hartington, between Ashbourne and Buxton, and adjoins the Cromford & High Peak Railway. The current cycle track passes the works which is still in production. The loco was briefly loaned to another DSF site at Wessington, near Crich during the latter part of 1956 and early 1957. However, it spent the vast majority of its time at DSF Friden moving skip wagons loaded with raw materials. The Friden works railway declined during the 1970s and ceased altogether in 1979. RH237914 was purchased and moved to the Welsh Highland Railway (1964) Ltd site in Porthmadog, leaving Friden in June 1982. Little attention was given to the loco whilst in Porthmadog, and it eventually left in August 1991 for storage in Herefordshire by John Quentin. The current owner moved the loco on 28/4/96, initially to his house for restoration and reassembly, and later moved it to the main MRT location at Cheadle on 24/7/97 where the loco was sufficiently complete to run on the main line. Following closure of the Cheadle site in 1998, the loco was stored at Whaley Bridge, and later at Bugsworth, before coming to Apedale on 2/7/2008, moving offsite again on 18th July 2008 for restoration work to continue. On 13 May 2024, the loco returned to Apedale.
