The EMD Model 40 was a two-axle diesel-electric locomotive built by Electro-Motive Corporation, and its corporate successor, General Motors' Electro-Motive Division (EMD) between August 1940 and April 1943. Nicknamed "critters", eleven examples of this locomotive were built. Powered by twin General Motors Detroit Diesel 6-71 diesel engines, which produce a combined 300 horsepower (224 kW). Original buyers included the Electro-Motive Corporation/EMD Plant #2 switcher, Defense Plant Corporation-4 units, the United States Army 3 units, and the United States Navy 2 units, General Motors Cleveland Diesel Division 1 unit.
- s/n 1134 Museum of Industry, Stellarton, Nova Scotia
- s/n 1308 scrapped
- s/n 1309 Lake Superior Railroad Museum/Duluth, Minnesota
- s/n 1834 Cushing Stone Company, Amsterdam, New York
- s/n 1835 Hoosier Valley Railroad Museum/North Judson, Indiana
- s/n 2284 a northwest Indiana locomotive rebuilder
- s/n 2285 Walkersville Southern Railroad, Walkersville, Maryland
- s/n 2286 scrapped
- s/n 2287 Travel Town Museum, Los Angeles, California
- s/n 2288 York County Heritage Trust, York, Pennsylvania
- s/n 2289 scrapped
- Extra 2200 South Issue #53 pages 22–23.