EMD GP40P-2

The GP40P-2 was a passenger-configured variant of the EMD GP40-2 road switcher, produced in extremely limited numbers for Southern Pacific Railroad. Only three units were constructed by the Electro-Motive Division in 1974, making the GP40P-2 one of the rarest members of the broader GP40 family. Southern Pacific ordered the locomotives to handle passenger train assignments, outfitting them with the necessary equipment to supply power and heat to passenger car consists. The designation followed EMD's standard Dash-2 naming convention, which indicated a series of electrical and control system improvements introduced across the GP40 product line during the early 1970s. Following the decline of Southern Pacific's intercity passenger operations, the three GP40P-2 units were eventually reassigned to freight service, a practical repurposing that extended their working lives considerably beyond the passenger era that originally justified their construction. The locomotives proved durable enough to outlast the service role for which they were designed. In subsequent decades, two of the three units passed to Union Pacific Railroad following that carrier's absorption of Southern Pacific in 1996, while the third unit was sold to the Indiana Harbor Belt Railroad, a Chicago-area switching and terminal railroad. The fact that all three units remained in service well into the post-merger period speaks to the fundamental robustness of the GP40-2 platform. Given that only three examples were ever produced, the GP40P-2 occupies a notable place in the history of EMD passenger power as an exceptionally small production run, built during a transitional period when full-scale intercity passenger rail in the United States was contracting sharply following the formation of Amtrak in 1971. Southern Pacific's decision to order new passenger locomotives in 1974 rather than rebuild existing units distinguished the GP40P-2 from many contemporary passenger diesel variants, which were more commonly produced through rebuilding programs applied to older freight equipment.

The GP40P-2 was powered by the EMD 645E3 prime mover, a 16-cylinder turbocharged two-stroke diesel engine producing 3,000 horsepower, the same power output found in standard GP40-2 freight locomotives. The locomotive rode on a B-B wheel arrangement, meaning two two-axle trucks, each axle equipped with a DC traction motor, providing the tractive effort needed for both passenger and subsequent freight assignments. As a Dash-2 series unit, the GP40P-2 incorporated EMD's modular electrical cabinet system, which replaced earlier wiring arrangements with more standardized, easier-to-service components, improving reliability and reducing maintenance time in the field. To fulfill its original passenger service role, the GP40P-2 was configured with provisions for supplying head-end power or steam heat to trailing passenger equipment, distinguishing it mechanically from the standard GP40-2 freight variant. The locomotive's frame was constructed to accommodate this additional equipment within the long hood. Its DC traction system was conventional for the period, as AC traction technology had not yet entered mainstream North American locomotive production. The combination of the proven 645E3 engine and Dash-2 electrical improvements gave the GP40P-2 a reliable mechanical foundation that allowed the units to transition successfully from dedicated passenger service into general freight operations without requiring fundamental mechanical reconstitution.

Models by: Athearn