Although prototype diesel locomotives ran in Britain before World War II, the railways of both the Republic and Northern Ireland changed over much more rapidly from steam to diesel traction than those in Britain, due to the island's limited coal reserves and an ageing steam locomotive fleet.
The Córas Iompair Éireann 113 class locomotives were the first mainline diesel locomotives used in Ireland, being built in January 1950 and October 1951 by CIÉ at their Inchicore Works. They were fitted with Sulzer 6LDA28 engines of 915 hp (682 kW), with four Metropolitan-Vickers MV157 traction motors. They were of Bo-Bo wheel arrangement, weighed 80 tonnes and had a maximum speed of 90 km/h (56 mph). They were initially numbered 1100–1101 in the steam locomotive number series, but were subsequently renumbered B113–B114 in 1957.
The Córas Iompair Éireann 101 Class locomotives, numbered B101-B112, were built in 1956 by the Birmingham Railway Carriage and Wagon Company. They were fitted with Sulzer 6LDA28 engines of 960 hp (720 kW), with four Metropolitan-Vickers MV137 traction motors. They were of A1A-A1A wheel arrangement, weighed 75 tonnes and had a maximum speed of 120 km/h (75 mph).
The Córas Iompair Éireann 201 Class was a class of 34 diesel electric locomotives manufactured by Metropolitan-Vickers at their Dukinfield Works in Manchester. They were a smaller, lighter and less powerful version of the 001 Class and were originally intended for branch line passenger and freight duties. They were introduced in 1956 and, although their duties changed over the years, were in regular service on the Irish railway network until the mid-1980s. Six were sold to Northern Ireland Railways (NIR) in 1986.
The NIR 101 Class is a class of diesel-electric locomotive formerly operated by Northern Ireland Railways (NIR). With the return to the working of the Enterprise service from Belfast to Dublin with coaching stock instead of augmented diesel railcar sets, NIR found itself with no suitable main line diesel locomotives. The 101 Class (DL) became the answer to the immediate problem working in conjunction with the newly acquired British Rail Mark 2 coaches.
The Iarnród Éireann (IÉ) / Northern Ireland Railways 201 Class locomotives are the newest and most powerful diesel locomotives operating in Ireland and were built between 1994 and 1995 by General Motors Diesel. They are model type JT42HCW, fitted with an EMD 12-710G3B engine of 3,200 hp (2,400 kW), weigh 108.862 tonnes and have a maximum speed of 164 km/h (102 mph).
The Córas Iompair Éireann 121 Class was a railway locomotive which was manufactured by General Motors Electro-Motive Division. These locomotives were in regular service on the Irish railway network until 2002, with the last two remaining in service until early 2008.
The Córas Iompair Éireann 181 Class locomotives were built in 1966 by General Motors Electro-Motive Division (EMD) and numbered B181 to B192.
A wide variety of hauled coaches have been used on the railways of Ireland. This page lists all those since 1945.
The Great Northern Railway V class steam locomotives were 4-4-0 three-cylinder compound locomotives built in 1932 by Beyer, Peacock & Company for the Great Northern Railway (Ireland).
The Great Southern Railways Class 800 steam locomotives were built principally for express passenger work on the Dublin to Cork main line of that company. These locomotives were designed under the supervision of E. C. Bredin with his Chief Draughtsman, H. J. A. Beaumont, preparing the drawings. They were the largest and most powerful engines ever to run in Ireland by quite a large margin, and the only three express passenger locomotives to be built in an independent Ireland.
The "Type K", number 801 was a diesel locomotive which was allocated to Córas Iompair Éireann (CIÉ) following the disbanding of the Great Northern Railway Board (GNRB) in 1958.
The Railway Preservation Society of Ireland (RPSI) is a railway preservation group founded in 1964 and operating throughout Ireland. Mainline steam train railtours are operated from Dublin, while short train rides are operated up and down the platform at Whitehead, County Antrim, and as of 2023, the group sometimes operates mainline trains in Northern Ireland using hired-in NIR diesel trains from Belfast. The RPSI has bases in Dublin and Whitehead, with the latter having a museum. The society owns heritage wagons, carriages, steam engines, diesel locomotives and metal-bodied carriages suitable for mainline use.
The Dublin and South Eastern Railway 15 and 16 were a pair of 2-6-0 steam locomotives which were built for the heavy goods (freight) traffic on the Dublin to Wexford main line of the Dublin and South Eastern Railway (DSER). The two locomotives were built by Beyer, Peacock and Company at their Gorton Foundry in Manchester.
The GS&WR Class 101, classified as Class 101 or Class J15 by the Great Southern Railways, was a class of 0-6-0 steam locomotives designed for working goods traffic although they did, and were quite capable of, working branch and secondary passenger trains.
The 2700 and 2750 Classes were two related types of diesel multiple unit operated by Iarnród Éireann. The 2700 Class units were 2-car sets; 25 cars were built by GEC Alsthom in 1997 and 1998, and began entering service in December 1998. Each car weighed 38 long tons and was fitted with a 350 hp (260 kW) underfloor Cummins engine with a maximum service speed of 110 km/h (68 mph).
The Irish Traction Group is a railway preservation society dedicated to preserving diesel locomotives from Irish railways. It was founded on 4 June 1989 with the intention of attempting to preserve at least one example of every type of diesel locomotive to have operated on the Irish Rail system. The ITG's locomotives and work are spread across three sites: Carrick-on-Suir railway station, the Downpatrick and County Down Railway (DCDR), and the West Clare Railway.
The Córas Iompair Éireann (CIÉ) 2600 Class were Associated Equipment Company (AEC)–engined diesel multiple units that operated InterCity and suburban services on the CIÉ system between 1952 and 1975. Many were later converted for push–pull operation with diesel locomotives, finally being withdrawn when displaced by the electric Dublin Area Rapid Transit service in the mid-1980s.
The Córas Iompair Éireann/Iarnród Éireann 071 Class or Northern Ireland Railways 110 Class or Serbian Railways JŽ series 666 is a General Motors Electro-Motive Division EMD JT22CW series diesel-electric locomotive used in the Republic of Ireland, Northern Ireland and Serbia.
The GS&WR 400 class or CIE class B2/B2a were a class of ten 4-6-0 steam locomotives built for the Great Southern & Western Railway (GS&WR) between 1916 and 1923 for express passenger duties on the Dublin to Cork main line. They proved initially unreliable but rebuilds from four to two cylinders between 1927 and 1937 for the seven survivors produced locomotives yielding satisfactory performance with the last two being withdrawn in 1961.
