On 9 January 2012, a trial service was introduced for six weeks by the NDA for its workers, with DRS supplying a Class 37 to haul four Mark 2 carriages between Carlisle and Sellafield. Although the trial was reported to have been a success, plans to introduce regular services from December 2012 did not materialise until May 2015. To operate these services, DRS purchased a fleet of Mark 2 carriages and had these overhauled at Eastleigh Works. In May 2015, the company started to operate some services on the Cumbrian Coast Line under contract to Northern Rail (later Arriva Rail North) using top and tail Class 37s which hauled Mark 2 coaches. On 27 July 2015, one of the Class 37s was replaced by a DBSO, with the other replaced at a later date. On 29 January 2018, one set was made to be Top and Tail Class 68's, while the other stayed a Class 37 and DBSO. On 21 May 2018, there was only one set out, which was the Top and Tail Class 68's only running between Carlisle and Barrow-in-Furness. This service was ultimately replaced by Class 156 Diesel Multiple Units (transferred from ScotRail) on 28 December 2018, with special commemorative 'farewell' service being run for charity on 11 January 2019.