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The power train transfers power from the engine to the wheels.
A bullet train gets it's power from extremely powerful magnets. The magnets are on the sides of the track, and train.
No, an alternator is not part of the power train. It is an auxiliary to provide electricity.
Yes, it's part of the drivetrain, also known as a power train.
Considered a "wear" item - not covered by power train wty.