The 22000 Class "InterCity Railcar" is a diesel multiple unit in service with Iarnród Éireann in Ireland.

They are the first IÉ DMUs built specifically for InterCity routes, although they can also work on some commuter routes. They are designed to operate at a maximum speed of 160 km/h (99.4 mph).

In 2005, the Irish Government announced the €34 billion Transport 21 proposal for significant improvements to transport infrastructure, with major emphasis on the railway network. As part of this, large-scale replacement of rolling stock was planned, then made up entirely of locomotive-hauled coaching stock, mostly British Rail Mark 2 and Mark 3. IÉ ordered 120 replacement vehicles: in a major departure, the new trains would be 3 and 6 car DMUs rather than locomotive-hauled carriages. This order was extended to 150 vehicles in 2005, to 183 vehicles in 2007 and to 234 vehicles in December 2008.^[3]

41 additional centre cars were ordered in 2019 for delivery from 2021.^[4] No new driving cars would be ordered but as many services operate with two units joined currently it would be possible to reconfigure and release more units.

All units underwent an in-service interior overhaul between 2019 and 2022. This programme included replacing the original cloth seats with leather and adding USB power sockets at each seating bay, amongst other changes intended to reduce ongoing maintenance and cleaning costs.^[5]

Supplied by Mitsui of Japan for approximately €400 million, the fleet was built by a partnership between Rotem of South Korea, who did the primary work, and Tokyu Car Corporation of Japan, who supplied the bogies. The first sets were delivered in March 2007, while the final sets were delivered in April 2012.

In March 2007, a €79 million order was placed for a further 33 vehicles to be used primarily on the outer Dublin commuter network. This was added to with an additional 51 Commuter vehicles in December 2008. As of 2015, there are 63 sets: 28 3-car sets, 25 4-car sets and 10 5-car sets, in three different layouts.

Two of the 3-car sets, 22010 and 22011, were delivered in July 2007 with corrosion damage received in transit from South Korea. IÉ did not accept delivery and stored the sets until October 2008 when they were returned to Rotem for repair, with a revised delivery date of early 2009.^[6] It was later determined that it was uneconomic to repair them, so Rotem added two additional units to the last order at no additional cost to IÉ.^[7]

In September 2022 the first of 41 new intermediates were delivered, with the final delivery in March 2023. On 14 March 2023 millage accumulation runs begun for the first three of the new intermediate B cars utilising 22209 and 22309 as 'tractor units'

The 22000 class was primarily ordered for InterCity routes except the Dublin-Belfast services operated by Enterprise and the Dublin-Cork service, for which IÉ purchased 67 locomotive-hauled coaches in 2006, but they have also been used on off-peak Dublin-Cork services since November 2009. 22000 units have now replaced coaching stock on services from Dublin to Galway, Westport, Limerick, Waterford and Tralee, and 2800 Class and 29000 Class DMUs to Sligo and Rosslare Europort.

The expansion of the Dublin commuter belt led IÉ to need dedicated long distance Commuter trains, and so purchased additional units for use on services to destinations such as Portlaoise, Carlow, Athlone, Dundalk, Kildare, and Longford; as well as Mallow in the Cork commuter belt.^[3]

Plans by Enterprise to improve its services included the potential of purchasing DMUs to replace its locomotive-hauled coaching stock. Among the options under consideration was the purchase of further 22000 Class units.^[8]

NI Railways was offered a variant of the 22000 Class to meet its "New Trains Two" requirement, before ultimately choosing a design similar to its existing Class 3000 unit, which became the Class 4000.^[9] The train was sometimes seen on the Dublin to Belfast railway line, on out-of-service transfer to Drogheda train service depot.

• Engine: MTU 6H 1800 R83, 12.8 L, 6 cylinder, 483 bhp gross,^[17] 386 bhp (288 kW) traction per car.
• Transmission: Voith T 312 R^[18]
• Top speed: 160 km/h (100 mph)
• Body: high quality stainless steel with some corrosion-resistant carbon steel components ^[18]
• Automatic PA and information display systems (Supplier: SA Viewcom)
• Fully air-conditioned (Supplier: Toshiba)
• Saloon, external view of doors and front-facing CCTV camera and recording system (Supplier: Verint)
• Catering facilities (some trains have buffet bars)
• Individual base seating
• Fire safety to BS 6853 Cat 1B, automatic fire extinguishing system for engines & fuel tanks
• All sets have Irish standard CAWS signaling systems and train radio.
• 3-car sets 22001–22006, as well as 5-car sets 22036–22039 have TPWS/AWS for operation on Northern Ireland Railways.

Irish manufacturer Irish Railway Models announced a 22000 Class model in October 2022 as their first DMU and it is due for release in 2024.^[19]

• Steam locomotives of Ireland
• Diesel locomotives of Ireland
• Multiple units of Ireland