A further problem was due to the locomotive and rolling stock arrangements. Unlike most other locomotive-hauled rolling stock in Ireland, generator vans were not part of the train – even the DVTs did not supply power. Thus the General Motors-built locomotives had to supply head-end power for lighting and heating throughout the train. Although many types of locomotive are well designed for this purpose, these particular locomotives had struggled under the extra strain. The wear on the locomotives and time out of service were unusually high. On at least two occasions locomotives had burst into flames while shuttling along the route. To avoid further damage, four Mark 3 Generator Vans entered service in September 2012.