Missouri Pacific EMC NW4 No. 4102.

(Electro-Motive Corporation, W. Lenheim Collection)



The EMC NW4, of which two examples were built for the Missouri Pacific Railroad, used the hood and cab configuration of the regular N-series, but with an additional straight section between cab and hood, mounted on a lengthened frame with large air tanks on the front platform, in front of the radiator. The additional hood section contained a steam generator; the NW4 was the first switcher so equipped, for switching passenger cars. The water tanks were mounted beneath the frame; the air tanks were therefore displaced to the front. The locomotives ran on AAR type B trucks re-used from EMC boxcab demonstrators No. 511 and 512. The two NW4s were EMC S/N 823 and 824, and were MP No. 4102 and 4103. They were scrapped in 1961.


Early EMC Switchers

Early Electro-Motive Corporation switcher locomotives were built with Winton 201-A engines. A total of 175 were built between February 1935 and January 1939. Two main series of locomotives were built, distinguished by engine size and output: the straight-8, 600 hp (450 kW) 'S' series, and the V12, 900 hp (670 kW) 'N' series. Both were offered with either one-piece cast underframes from General Steel Castings of Granite City, Illinois, denoted by 'C' after the power identifier, and fabricated, welded underframes built by EMC themselves, denoted by 'W'. This gave four model series: SC, SW, NC and NW. Further developments of the 900 hp (670 kW) models gave model numbers NC1, NC2, NW1, and NW1A, all of which were practically indistinguishable externally from the others, as well as these unique NW4 models for the Missouri Pacific Railroad and a solitary, twin-engine T transfer locomotive model built for the Illinois Central Railroad.