The power cars contained 120 b.h.p AEC engines and a 5 speed mechanical transmission and were capable of around 60 m.p.h. Interestingly it was possible to have 4 power cars per set however trains never ran in this formation. When working in push-pull mode the main motive power consisted of a CIÉ 201(C) Class, following the withdrawal of these locomotives, they were hauled(or pushed) by the EMD 121 Class.
The conversion of the sets to push-pull operation was performed by removing the main engines from all power cars and leaving the train lighting generator and steam heating boiler in 50% of the power cars. The 50% of power cars that had the generator and boiler retained had it's cab converted into a vestibule and its windscreen blanked out. All but one of the power cars were scrapped in Mullingar in the 1980s, the final remaining power car has been rescued after 30 years of dereliction by the Downpatrick & Co. Down Railway where it will eventually be restored as a push pull control car.