two additional units to the last order at no additional cost to IÉ. Operations 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. 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. 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. The train was sometimes seen on the Dublin to Belfast railway line, on out-of-service transfer to Drogheda train service depot. Unit types As delivered, the first 30 units were of three cars, for use on InterCity routes, as were ten of the 15 6-car units. The remaining five 6-car sets and the 17 3-car sets ordered in 2008 were configured for long-distance Commuter services from Dublin. Combinations of two 3-car sets, three 3-car sets, two 4-car sets, a 3-car set + a 4-car set and two 5-car sets are possible. In case of emergency, they can operate in formations of up to 18 cars. A1 22131–40: Driving car, catering, wheelchair accessible WC, one wheelchair space, 36 1st class seats A2 22207–30,41–63: Driving car, standard WC, 66 seats A22 22201–06: A2 car with NIR TPWS/AWS & radio system A3 22307–63: Driving car, wheelchair accessible WC, two wheelchair spaces, bicycle storage, 54 seats A33 22301–06: A3 car with NIR signal & radio system & parcels/bike space B 22401–63, 631–45, 731–45: Intermediate car, standard WC, 72 seats B1 22531–45: B car with sanding system 3-car sets: A2/A22 - B - A3/A33 4-car sets: A1/A2 - B - B/B1 - A3 5-car sets: A1/A22 - B - B1 - B - A3/A33