The EMD GP50, Late Model "Geep"

The Electro-Motive Division's GP50 was only marginally successful when compared to earlier designs like the GP40 and GP38 series. By the time the models were released by EMD beginning in 1980 railroads had begun to prefer six-axle power over four-axles and only a few hundred of each were ever built for six different Class I systems. Of course, during that time poor sales for B-B trucked locomotives wasn't the only issue EMD was dealing with. General Electric was providing stiffer competition to the once entrenched industry leader, particularly with its C30-7 and C36-7 models in production at the time. Unfortunately, EMD likely due to complacency, would eventually lose its lead role to GE before the 1990s. In any event, in spite of the few GP50s built because the units are still relatively new at only 20+ years of age many can still be seen in active service throughout the country, even on Class Is. None are known to yet be preserved either given their age.

The most significant difference in the GP50 from earlier designs like the GP40 was upgraded components (like a turbocharger silencer and new type of blower housing) and increased horsepower. It also included features already common on earlier models such as dynamic braking (a system for temporarily employing traction motors as generators and using the resulting electromotive force to slow the train), and an airtight hood that kept out dust, dirt and other particles from reaching internal components.

Interestingly there was also a GP59 model cataloged by EMD built between 1985 and 1989. At only 12-cylinders, using a 710G3A model prime mover, compared to the standard 16-cylinders, the unit was rated at 3,000 hp. Despite the decrease in horsepower the locomotive was also more fuel efficient. All were purchased by Norfolk Southern (a total of 36 units) and save for one, the fleet remains in active service for the railroad. Perhaps the most famous of the units is #4610 which was commissioned by NS to commemorate the Southern Railway and is adorned in the predecessor’s beautiful green, white and gold livery. #4610 typically remains in service on NS’s southern lines so be on the lookout for it.

While the GP50 was not considered a success railroads could count on their reliability and dependability, which made EMD legendary. In any event, be on the lookout for them, as there are still many roaming around out there! For technical data regarding the EMD GP50 please click here. Also, for information about EMD's GP series please refer to the chart below.

Please Click Here To Return To The Main Diesel Locomotives Section

Electro-Motive Division's "General Purpose" Road Switchers

Another book that covers modern diesel locomotives is Locomotives: The Modern Diesel and Electric Reference by author Greg McDonnell. Mr. McDonnell's book is much larger in scope than Modern Diesel Locomotives, covering newer diesels and electrics on nearly 250 pages which are packed full with excellent photography, illustrations, and diagrams. The book has received superb reviews by readers and is perhaps the best current work out there covering the topic. If you're interested in perhaps purchasing either (or both) of these books please visit the links below which will take you to ordering information through Amazon.com, the trusted online shopping network.

Share Your Thoughts