SOLUTION

The energy input to the motors is called energy consumption. This is the energy consumed by various parts of the train for its propulsion. The energy drawn from the distribution system should be equal to the energy consumed by the various parts of the train and the quantity of energy required for lighting, heating, control, and braking. This quantity of energy consumed by the various parts of the train per ton per kilometer is known as specific energy consumption. It is expressed in watt-hours per ton per km.

Specific energy consumption = Total energy consumed in Wh ⁄ train mass in tonne × run length in km

The specific energy consumption is inversely proportional to the distance between stations. The greater the distance between stops is, the Lesser will be the specific energy consumption The typical values of the specific energy consumption is less for the mainline service of 20-30 W-hr/ton-km and high for the urban and suburban services of 50-70 W-hr/ton-km.