The Great Northern Railway of Ireland (GNRI) AEC Class were Associated Equipment Company (AEC)–engined diesel multiple units (normally termed railcars in Ireland) that operated InterCity and suburban services on the GNRI and later Ulster Transport Authority (UTA) systems between 1950 and 1975. They were finally withdrawn in 1972. They were the inspiration for the CIÉ 2600 Class. History After 1945 the GNR(I) found itself in a poor financial position as a result of the deprivations of World War II and increased competition from road traffic. It looked to diesel power as a way to streamline costs and bring them back into profitability. Along with diesel locomotives, railcars offered a cheaper and more flexible means of traction than steam-hauled coaches. As a result, in June 1950 the GNR(I) introduced the first of 20 diesel-mechanical railcars (numbers 600–619) ordered from AEC Ltd. of Southall. Design These cars, based on a 1930s AEC/Great Western Railway design, were powered by two AEC underfloor engines of 125 hp, each one driving the inner axle of one bogie through a five-speed, pre-selective epicyclic gearbox. They cost £18,500 each () and were capable of . The bodywork was built by Park Royal Vehicles, which like AEC was part of the ACV Group. The design incorporated a full width cab at the front and a guard's and luggage compartment at the rear, as well as a steam-generating unit. Passenger accommodation was in two saloons, a 12-seater first-class saloon, located immediately behind the driving cab, giving passengers a clear view to the line ahead, and 32 seater third-class saloon. The power cars could operate with either one or two unpowered intermediate coaches. These coaches were built by the GNR(I) at its Dundalk Works. The GNR(I) railcars were painted in cream and dark blue. Service Although limited to four coaches, the AEC's were put in service on the Dublin – Belfast Enterprise service. As a result, these units had the distinction of being the first successful main line diesel railcars in either Ireland or Britain. Upon dissolution of the GNR in 1958, 10 AEC's went to CIÉ (Where they joined the existing fleet of AEC railcars, with each vehicle number receiving an 'n' suffix), and 10 went to the UTA. The UTA had experimented with AEC railcars in 1951 as well, turning out two power cars, No.'s 6 and 7. The former GNR's AEC's (Now renumbered 111 -120) were technically