Fuel TankDiesel fuel stored below the frame.
→Prime MoverDiesel engine makes mechanical power.
→AlternatorProduces electrical power.
→ControlsManage electrical output and wheel slip.
→Traction MotorsTurn the axles through gearing.
→Wheel / RailAdhesion creates pulling force.
Cooling
Radiators and fans remove heat from the engine and supporting systems.
Dynamic braking
Traction motors act as generators during braking and help slow the train.
Air compressor
Supplies compressed air for locomotive and train braking systems.