The Corby RSH tanks had little in common with the Austerities, they became the standard locos on the minerals side at Corby. A near relative was S&L No 24 which was a Hunslet 50550, basically the prototype on which the Austerity was based. The main differences being deeper buffer beams, backhead injectors as opposed to underslung type and one or two minor details. 24 was the first of eight ordered for a project to link Islip Ironworks with the Corby system but the it never came to fruition and the remaining seven were cancelled by S&L.
24 remained unique at Corby and no Austerities ever worked followed it, the RSHs proving their worth with several added to stock in the post war years. After a very brief period on the minerals fleet, it was transferred to the works stock at Corby and worked the heavier duties, mainly coke ovens, iron ladles from the blast furnaces to the steelmaking plant and slag disposal. It escaped the cutter and after a period in the care of Corby Model Rly Club, is now on permanent loan to the Rutland Rly Museum.