Progress Rail PR43C
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The Progress Rail PR43C was a C-C genset diesel-electric locomotive built by Progress Rail Services Corporation. It was the result of a conversion of existing
EMD SD50 The EMD SD50 is a diesel-electric locomotive built by General Motors Electro-Motive Division. It was introduced in May 1981 as part of EMD's "50 Series"; production ceased in January 1986. The SD50 was a transitional model between EMD's Dash ...
locomotives. This involved replacing the original
EMD 645 The EMD 645 is a family of diesel engines that was designed and manufactured by the Electro-Motive Division of General Motors. While the 645 series was intended primarily for locomotive, marine and stationary engine use, one 16-cylinder versio ...
prime mover Prime mover may refer to: Philosophy *Unmoved mover, a concept in Aristotle's writings Engineering * Prime mover (engine), motor, a machine that converts various other forms of energy (chemical, electrical, fluid pressure/flow, etc) into energy ...
with a pair of
Caterpillar Caterpillars ( ) are the larval stage of members of the order Lepidoptera (the insect order comprising butterflies and moths). As with most common names, the application of the word is arbitrary, since the larvae of sawflies (suborder Sy ...
engines, a 12 cylinder C175 engine and a C18 engine. The locomotive was jointly designed by Progress Rail and
Norfolk Southern Railway The Norfolk Southern Railway is a Class I freight railroad in the United States formed in 1982 with the merger of Norfolk and Western Railway and Southern Railway. With headquarters in Atlanta, the company operates 19,420 route miles (31 ...
. Development began in 2008. Three locomotives were built; they were manufactured at Progress Rail's
Mayfield, Kentucky Mayfield is a home rule–class city and the county seat of Graves County, Kentucky, United States. The population was 10,017 as of the 2020 United States Census. History 19th century Mayfield is in the center of the Jackson Purchase, an ei ...
factory. Two operated in revenue freight service on Norfolk Southern, while a third operated as a demonstrator unit for Progress Rail. At one time Norfolk Southern had four more PR43Cs on order. The locomotives operated by Norfolk Southern worked on freight trains in central Illinois, leading to speculation that they were being tested, as Caterpillar's headquarters are located in
Peoria, Illinois Peoria ( ) is the county seat of Peoria County, Illinois, United States, and the largest city on the Illinois River. As of the 2020 census, the city had a population of 113,150. It is the principal city of the Peoria Metropolitan Area in Ce ...
. The process of converting an SD50 to a PR43C altered the external appearance of the locomotive; the original radiator section was replaced with a larger one similar in appearance to that of an
EMD SD70ACe The EMD SD70 is a series of diesel-electric locomotives produced by the US company Electro-Motive Diesel in response to the GE Dash 9-44CW. Production commenced in late 1992 and since then over 5,700 units have been produced; most of these are t ...
or SD70M-2. As a result of repeated failures, the locomotives were retired in 2017, and all were cut up for scrap in 2018.


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* {{Green Locos C-C locomotives Diesel-electric locomotives of the United States Railway locomotives introduced in 2009 Norfolk Southern Railway locomotives Rebuilt locomotives Standard gauge locomotives of the United States