The Railpower RP20BD is a diesel‑battery hybrid switch locomotive produced by Railpower Technologies, an American company that specialized in hybrid railway propulsion systems. Introduced in the early 2000s, the RP20BD was designed for yard and short‑haul switching duties, offering reduced fuel consumption and lower emissions compared with conventional diesel‑only switchers.
Design and technical characteristics
- Powertrain: The locomotive combines a small diesel engine, which functions as a generator, with a high‑capacity battery bank that supplies electric traction power to the traction motors. This configuration enables the locomotive to operate in pure electric mode for short periods and to capture regenerative energy during braking.
- Power rating: The model designation “RP20BD” indicates a nominal power output of approximately 2,000 horsepower (1.5 MW).
- Wheel arrangement: It employs a B‑B wheel configuration (two two‑axle trucks), typical for switch locomotives requiring good maneuverability and weight distribution.
- Emissions and fuel efficiency: By relying on battery power for a portion of its operation, the RP20BD can achieve lower diesel fuel usage and reduced exhaust emissions relative to traditional diesel switchers, aligning with environmental regulations and operator cost‑saving goals.
Operational use
Railpower marketed the RP20BD to freight railroads and industrial operators seeking environmentally friendly switching solutions. Units were placed in service on several North American railroads, where they performed tasks such as assembling trains, moving cars within yards, and providing short‑distance freight moves.
Company background
Railpower Technologies, founded in the late 1990s, focused on developing hybrid locomotive technology. The RP20BD, along with other models such as the RP30BD, represented the company’s effort to commercialize battery‑assisted diesel locomotives. Financial difficulties led to the company’s bankruptcy filing in 2010, after which its assets and technology were acquired by other firms.
Status
Production of the RP20BD ceased following Railpower’s closure, and the model is no longer manufactured. Existing units remain in limited service, often maintained by specialized operators or retrofitted with updated battery systems.
