In 2014, a mid-life refurbishment programme was announced for the Enterprise service. Rotating refurbishment involved substituting non-Enterprise trainsets on an individual basis which began in November 2014 with the return to service of the first revamped coaches in November 2015. Refurbishment provided new mechanical running gear, in coach electronics and modernised interiors. The first refurbished set, consisting of DVT 9002 and Locomotive 206, operated a trial service from York Road Depot in Belfast to Dublin Connolly and back, on 15 October 2015. The same set operated the first official passenger service after its refurbishment on 16 November 2015. The refurbishment was officially completed on 10 April 2016, to coincide with the introduction of an enhanced Enterprise timetable.