In order to pull the heavy passenger trains, on both main and secondary lines, Germany built the P.8 locomotive series. They proved to be sturdy and easy maintenance, they also had a reduced fuel consumption given the max. speed of 100 km/h and the tractive effort.
Due to easy adaptation to the operational conditions in Romania, in 1932 Resita started the constructions of such locomotives as Series 230. UDR manufactured a total of 139 units during 1932 and 1937.