EMD SD40-2

Technical Specifics

The EMD SD40-2 entered production in January 1972 as part of Electro-Motive Division's Dash 2 series, a broad update to its existing road switcher lineup that introduced modular electronic control systems adapted from experience gained with the experimental DDA40X. The new model was positioned to compete directly against General Electric's U30C, and despite the availability of higher-horsepower alternatives including EMD's own SD45-2, the SD40-2's combination of reliability, fuel efficiency, and straightforward maintainability quickly made it the preferred choice of major American railroads. Peak production occurred in the mid-1970s, when large orders from carriers such as Burlington Northern, Union Pacific, and Conrail helped establish the type as the dominant heavy freight locomotive in North America. Sales began to soften after 1981 as a combination of factors eroded the model's market position, including the lingering effects of the energy crisis, intensifying competition from General Electric's Dash-7 series, and the introduction of EMD's own higher-horsepower SD50. The last SD40-2 delivered to a domestic United States railroad left the factory in July 1980, though production for Canadian, Mexican, and Brazilian customers continued into late 1980, and export variants were constructed considerably longer, with a specialized SDL40-2 variant delivered to Mauritania as late as 1997. When total production across all variants is tallied, approximately 3,982 to over 4,000 units were built, making the SD40-2 one of the best-selling diesel locomotive models in North American history, surpassed in EMD's catalog only by the GP9. The SD40-2's legacy extended well beyond its production years. Thousands of units remained in active mainline and secondary service for decades after manufacture, and many were subjected to substantial rebuild programs by major railroads seeking to extend their service lives rather than replace them outright. Union Pacific alone rebuilt hundreds of its SD40-2 fleet into updated SD40N configurations at its Jenks Shop facility, equipping them with modern microprocessor control systems. The model also formed the mechanical basis for numerous export variants sold to railroads in South America, Europe, Africa, and Asia, demonstrating the broad adaptability of the underlying design.

Model Train Manufacturers

Brands that produce EMD SD40-2 in HO scale

Prototype Reference

Real-world information about this equipment type