Romania
Romania designed its 151.000 Class as freight locomotives, in order to serve the Căile Ferate Române (CFR). These locomotives used a straightforward two-cylinder 650 by 720 millimetres (25.591 by 28.346 inches) engine with 1,500 millimetres (59 inches) diameter driving wheels and a total weight in working order of 123 tonnes (121 long tons; 136 short tons). The heating surface of the boiler was 254.8 square metres (2,743 square feet), of which 98.5 square metres (1,060 square feet) were superheated, while the grate area was 4.72 square metres (50.8 square feet). At 21,294 kilograms-force (208,820 newtons; 46,950 pounds-force) tractive effort, they were the most powerful steam locomotives built in Romania.
Two of these locomotives were built by the Malaxa Works in 1939 and 1941, numbered 151.001 and 151.002. Number 151.002 was preserved.