EMD GT22CUM-1

The EMD GT22CUM-1 is a narrow gauge diesel-electric locomotive with six axles in two trucks, a C-C wheel arrangement. It was built by Villares under licence from EMD for service in South America. The state railway Rede Ferroviaria Federal Sociedade Anonima bought about 55 in the early 1980s to expand its locomotive fleet, because it needed a powerful single-engine locomotive with low weight per axle for its metre gauge lines, and the GT22 was the highest-rated model EMD then offered. The designation encodes the design: G for general use, T for turbocharged, 22 for a 12-cylinder 645E diesel engine, C for the C-C wheel arrangement, U for metre gauge and M1 for model one. A related later variant carries the designation GT22CUM-2.