Electro-Motive Diesel

Electro-Motive Diesel. It is a premier American manufacturer of diesel-electric locomotives and large diesel engines, primarily for the rail transport industry. Founded in 1922, the company played a pivotal role in the transition from steam locomotives to diesel power, fundamentally reshaping North American railroads. Headquartered in La Grange, Illinois, it is now a subsidiary of Progress Rail, which is itself part of the global industrial giant Caterpillar Inc..

History

The company was established in 1922 as the Electro-Motive Engineering Company in Cleveland, Ohio by Harold L. Hamilton and Paul Turner. Initially a consultancy, it began building diesel-electric railcars, attracting the attention of General Motors, which purchased the firm in 1930. Under General Motors, the new General Motors Electro-Motive Division (EMD) achieved a historic breakthrough with the 1939 introduction of the EMD FT, a demonstrator unit that conclusively proved the superiority of diesel over steam on long-haul freight. This success led to the "Dieselisation" of American railroads, with EMD locomotives like the GP7 and SD40 becoming industry standards. In 2005, the business was sold to a partnership of Greenbriar Equity Group and Berkshire Partners, reverting to the Electro-Motive Diesel name, before being acquired by Progress Rail in 2010.

Products

The company's product line has historically centered on a complete range of diesel locomotives. Its most famous early freight models include the F-unit and the versatile "Geep" (GP) series. For higher horsepower needs, it developed the successful SD ("Special Duty") series, such as the SD40-2. In the passenger realm, the sleek E-unit dominated for decades. Electro-Motive Diesel also manufactures prime movers for marine propulsion and power generation. Its engines, particularly the enduring 567, 645, and modern EMD 710 series, are renowned for their durability and have been used in applications worldwide, from Norwegian State Railways vessels to United States Navy landing craft.

Technology and innovations

The firm's engineering legacy is defined by the perfection of the diesel-electric powertrain, integrating a high-speed diesel engine with a traction motor on each axle. A landmark innovation was the EMD 567 engine, the first mass-produced, uniflow-scavenged, two-stroke diesel designed specifically for locomotives. The company pioneered standardized, modular locomotive design, allowing for easier maintenance and component swapping, a philosophy evident in the GP and SD models. Later advancements included the adoption of alternators over direct current generators and the development of microprocessor-based control systems. Its Electro-Motive Diesel test facilities in La Grange, Illinois were among the most advanced in the industry, crucial for developing emissions-compliant engines like the EMD 710.

Corporate affairs

Following its acquisition by Progress Rail, the company has been integrated into the larger Caterpillar Inc. organization. Its primary manufacturing plant remains in La Grange, Illinois, with additional production historically in London, Ontario, under General Motors Diesel. The company has faced significant labor disputes, most notably a 2011 lockout at its London, Ontario facility that ended with the plant's closure. As part of Progress Rail, it leverages global supply chains and shares technology with other divisions, such as Progress Rail Services. Its main competitors in the locomotive market include GE Transportation (now Wabtec) and Siemens Mobility.

Impact and legacy

Electro-Motive Diesel's impact on rail transport is profound, directly enabling the near-total disappearance of the steam locomotive in North America by the 1960s. Its reliable, cost-effective locomotives increased average train speeds and reduced operating costs for railroads like the Atchison, Topeka and Santa Fe Railway and Union Pacific Railroad, revitalizing the industry. The company's designs influenced global manufacturers, including General Electric and English Electric. Thousands of its locomotives, many rebuilt and modernized, remain in service across Class I railroads, regional railroads, and industrial railways worldwide, a testament to their rugged design. The F-unit and GP7 are iconic symbols of the Dieselisation era, preserved in museums and operated by historical societies like the Nevada Northern Railway.

Category:Locomotive manufacturers Category:Companies based in Illinois Category:Manufacturing companies established in 1922