60021 Pen-y-Ghent was allocated to the Railfreight Metals subsector at Thornaby once it had entered British Rail service on 14 December 1991 and it subsequently carried the name Star of the East during EWS service. In 2014 Colas purchased ten Class 60s from DB Schenker, including 60021, but in June 2018 Colas sold these locomotives on to GBRf.

Still running in Colas' orange and yellow livery, GBRf removed 'Colas' from the locomotive sides and gave 60021 the name of Bustler, which it held until 21 May 2019, emerging from Eastleigh Works with a full GBRf livery and reverting to its original name, Pen-y-Ghent.