Long-Hood Diesel Locomotive
A diesel locomotive features a long engine hood, an elevated driver cab, and side ventilation grilles.
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Characteristics of a Long-Hood Diesel Engine
Diesel-electric locomotives use powerful diesel engines to generate electricity that drives electric traction motors on the axles. The long hood section houses the internal combustion engine and cooling equipment, with ventilation grilles mounted along the sides to dissipate heat. Positioned alongside the hood, the high-mounted driver cab gives rail operators an elevated perspective over the track corridor.
Why Diesel Locomotives Use Electric Motors
Although called diesel engines, most modern locomotives are actually diesel-electric hybrids. The diesel engine drives an electric generator, which powers electric motors on the wheels because electric motors deliver smooth torque at low speeds without needing a complex gear transmission.
Colors of Diesel Rail Engines
- Long hood and cab body: yellow, dark red, or navy blue
- Side ventilation grilles: matte black or charcoal gray
- Cab windshields: clear or light blue tint
- Underframe chassis: dark gray or black