Originally new from Vulcan Foundry in February 1965 as D6966, the locomotive this RailRoad model is based on became 37266 under the TOPS numbering system in 1974. Its career started at Tinsley, Sheffield and it also had postings at Stratford and Landore under BR. In January 1986 it was reclassified to 37/4 and renumbered 37422. The locomotive has worn several liveries and had several different operators, including EWS, DB Schenker, and DRS. It became part of the Harry Needle Railroad Company spot hire fleet based at Barrow Hill, which was taken over by Swietelsky, an Austrian-based railway construction and maintenance contractor, in January 2025. The locomotive was named ‘Pegasus’ later the same year.