1. Diesel Engine is the main power source for the locomotive.

2. It comprises a large cylinder block, with the cylinders arranged in a V .

3. The engine rotates the drive shaft at up to 1,000 rpm and which rotate

alternator`s shaft.

4. Then electric transmission is obtained to run traction motors by the

electricity generator or alternator, through rectifiers .

Diesel EngineControl StandAir IntakesRadiator and

Radiator FanTurbo ChargingMotor BlowerFluid CouplingTruck FrameAir CompressorCab

Main AlternatorAuxiliary AlternatorRectifiers/Inverters Electronic Controls BatteriesTraction Motor Fuel TankAir ReservoirsDrive ShaftGear BoxWheelPinion/Gear

Main AlternatorIt provides the power to move the train. The alternator generates AC electricity which is used to provide power for the traction motors mounted on the trucks (bogies). The AC output is rectified to give the DC required for the motors.

Auxiliary AlternatorTo provides AC power for lighting, heating, air conditioning, dining facilities etc. on the train.

Electronic ControlsIt consists of various components of loco and usually collected in a control cubicle near the cab for easy access

BatteriesTo provide electrical power for lights and controls when the engine is switched off and the alternator is not running.

Traction MotorThey take electricity from the alternator thru rectifiers and run the wheels of loco by gear pinion attachment. There are between four and six motors on most diesel-electric locomotives.

Rectifiers/InvertersTo convert Ac to Dc supply or Dc to Ac supply.

Diesel Engine

It is the prime mover of engine & runs all components.

Air Intakes

It sucks and filter the air from surroundings

Turbo Charging

Turbo charging is used to increase the amount of air pushed into each cylinder. The turbocharger is driven by exhaust gas from the diesel engine.

Wheel

These are specially profiled alloy steel wheels to bear the locomotives load and run it by phenomenon of friction

Air Compressor

Its is used to provide a constant supply of compressed air for the locomotive and train brakes

Truck FrameTruck frame or bogie is a casted frame carrying the wheels and traction motors of the locomotive and also support it`s components.

Pinion/GearThe traction motor drives the axle through a reduction gear of a range between 3 to 1 (freight) and 4 to 1 (passenger). Fuel Tank

To carry its own fuel needed for trip.it can store a large quantity of fuel 2000-4500 liters.

Air ReservoirsAir reservoirs containing compressed air at high pressure are required for the train braking and some other systems on the locomotive.

Cooling components

Motor Blower The diesel engine also drives a

motor blower. As its name suggests, the motor blower provides air which is blown over the traction motors to keep them cool during periods of heavy work.

Radiator and Radiator Fan

It cools the locomotive by radiation

evaporation method.

Controlling components:-

Electronic Controls It consist of various electronic

components to control all the components of locomotive.

Control Stand This is the principal man-machine

interface, known as a control desk

Cab it consists of various switches, gauges

and controlling levers to control locomotive working.

Gear Box It drives the radiator and radiator fan

by main shaft of diesel engine.

Supply of airRemoval of exhaustTurbochargingSupply and injection of fuelLubricationCooling

Connecting rod

Bearings and flywheel