SD40-2 Diesel Locomotive

Prototype Information

EMD produced the SD40-2 between 1972 and 1989 as the cornerstone of its Dash 2 series. This locomotive became the most popular model in EMD’s history, with nearly 4,000 units built for North American railroads. It used a turbocharged 16-cylinder 645E3 engine that generated a reliable 3,000 horsepower. The Dash 2 design introduced modular, solid-state electronics, which made troubleshooting much faster for maintenance crews. EMD built the unit on a long 68-foot frame that became famous for its large porches at each end. These extended platforms were necessary to accommodate the new HT-C trucks while using the same hood length as the original SD40.

The SD40-2 earned a reputation as a remarkably versatile and mechanically reliable machine. Major railroads like the Burlington Northern, Union Pacific, and Canadian Pacific bought hundreds of units for everything from heavy coal drags to high-speed intermodal trains. Specialized versions also entered production, such as the SD40T-2 tunnel motors for Western mountain ranges and the wide-cab SD40-2W for Canadian service. While newer locomotives offer more horsepower, many SD40-2s remain in service today after 50 years of operation. Their simple design and durable components continue to make them a staple for short-line railroads and heavy yard switching.