The
Great Northern Railway (Ireland)(GNR(I)) introduced the service as the "Enterprise Express" on Monday 11 August 1947 in an attempt to compete with air and road transport which were challenging the railways. The inaugural service was hauled by GNR (I) Steam Locomotive No.83 "
Eagle." This name would later appear on
NIR Diesel Electric locomotive No. 101. The next development took place in 1950, when new
AEC /
Park Royal Vehicles Diesel Mechanical Railcars were introduced on the Dublin-based train. This train, however, had to be restricted to four coaches - one of the limitations of these particular units. They did have the distinction, however, of being the first successful mainline diesel railcars in the
British Isles. In October 1953 the governments of the Republic of Ireland and Northern Ireland nationalised the GNR as the Great Northern Railway Board (GNRB). The GNRB ordered new diesel-mechanical railcars of a more powerful design, which by using intermediate power cars with half-cabs and gangway ends, were capable of operating in sets of up to 8 coaches. Referred to as
B.U.T. railcars, due to their design by
British United Traction, they were introduced on the Belfast-based train in 1957 and the Dublin-based train in 1958, enabling timings to be reduced to 2 hours 10 minutes, and ending steam traction on
Enterprise. with an average speed of respectively. The
Railway Preservation Society of Ireland runs a steam Enterprise in the summer months to exchange its Dublin-based engine with its Whitehead-based engine.
Autumn 2009 disruption On Friday 21 August 2009 of the
Broadmeadow estuary viaduct, north of Malahide, collapsed, causing serious disruptions to Enterprise services. During the disruption the Enterprise operated between Belfast Central and Drogheda, with buses connecting Drogheda with Dublin Connolly. The line reopened on Monday 16 November with full services resumed.
Mid-life refurbishment The Enterprise underwent a face-lift during between November 2007 and early 2009, with the carriages being resprayed in silver with green livery, some of which could be seen at Translink's York Road Maintenance Depot. 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 a 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 Thursday 15 October 2015.
Recent developments Press reports from 2007 have stated that NIR & IÉ plan to introduce a new hourly service. This was reiterated in a statement by
Conor Murphy, the then Northern Ireland Minister for Regional Development, who stated that the two companies had made a presentation to the
North/South Ministerial Council in October 2007 putting forward the case for improvements in the frequency and speed of the service. Any improvements to the service would require significant investment in track and signalling, as well as new rolling stock. In April 2008, the then Minister for Regional Development stated that the major improvements to the infrastructure and rolling stock required by Enterprise would be in the region of £500 million. However, the introduction of an hourly timetable remains an ambition for NIR and IÉ. Enterprise would require a minimum of seven trains to operate an hourly service – until 2013, IÉ had a significant number of stored
Mark 3 rolling stock available, of which five sets were push-pull capable. However, all of IÉ's Mark 3 carriages were scrapped during 2013 and 2014. NIR also withdrew its
"Gatwick" set in June 2009 and it has been preserved by the RPSI. The introduction of the 22000 Class could potentially be used to enhance the frequency of the Enterprise which has led to a surplus of locomotives that could be utilised. The major issue remains the capacity at , which is stretched. In July 2024, as part of a set of major improvements to its national timetable, Iarnród Éireann announced that Enterprise would transition to an hourly frequency following the opening of
Belfast Grand Central. The expanded service operates from Monday–Saturday, and allows arrivals in both Belfast and Dublin before 9.00am. In order to meet the new service frequency from its launch, the existing Enterprise fleet is being supplemented by a pair of
22000 Class units, and one double
Class 3000 unit from
NI Railways, each of which are six cars long. This is until the planned entry into service of the new fleet from 2029. The service began on 29 October 2024. ==Rolling stock==