Had you ever thought how local train runs without an engine (Locomotive). Express train has one or more than one locomotive to pull the train coach, but local train does not have locomotive so how local train coaches get pulled??
Local train does not have an engine, but local trains have Motors coupled to wheels of local trains. Not for every coach, but after Avery 3 coaches of the local there is one Motor running the wheels, So that's why local train has more than one pentagram.
For every 3 coach of local train one motor is there, and this motor gets powered from the pentagram assigned to train. Below the pantograph there is one closed coach written with DANGER in this section MOTOR DRIVE (Regenerative DC Drive) is present. As a middle coach has the pantograph with motor then one coach gets pulled and another one gets push. As local train is running on push and pull basic operation it help to accelerate fast.
Pentagram get energy from overhead wire and provide to Motor Drive and then Motor Drive regulates and run the Motor. And then based on the throttle (throttle control of loco pilot) present in Cockpit of local train. motor speed and torque regulated by Motor Drive, And as Motor is coupled with wheels, train start running.
Thanks and Regards
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