55079s

The designation "55079" is commonly associated with a specific model of diesel-electric locomotive produced by the General Motors Electro-Motive Division (EMD). Introduced in the late 1960s, the **EMD SD50** was originally designated as the **SD50-2** before being rebranded as the **SD50** in 1972. The "55079" designation, however, is not a model number but rather a unique unit identification number assigned to individual locomotives within a fleet.

The SD50 series was part of EMD’s "Dash 2" line, featuring improved reliability, fuel efficiency, and performance compared to earlier models. These locomotives were widely used by North American railroads, particularly for freight hauling, due to their robust power output and versatility. The SD50 was powered by a 3,000 horsepower (2,200 kW) 16-cylinder EMD 645E3 prime mover, capable of pulling heavy loads over long distances.

The number "55079" specifically refers to a single SD50 locomotive, likely operated by a major railroad such as Union Pacific, Burlington Northern, or Canadian National. Locomotives are often assigned sequential numbers for tracking and maintenance purposes, with "55079" being part of a larger fleet numbering system. Over time, some SD50s were modified or repowered, while others were retired and either preserved, sold for scrap, or repurposed in industrial or heritage rail applications.

The SD50 series remained in production until the early 1970s, with variations including the **SD50F** (a fuel-injected version) and later models like the **SD60** and **SD70**. Many of these locomotives continue to operate on North American railroads, though some have been replaced by newer, more advanced models. The legacy of the SD50 series extends beyond its technical specifications, influencing later locomotive designs and maintaining a presence in railroading history.