Each of the four wheels contains an electric motor, drive train, suspension and steering and braking mechanisms.

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If something gets in the way of the door--a person's foot or a roof panel that's hanging down--the electric motor that closes the train door has to work harder and produces more current.

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He pointed out, for instance, that the train had lost out to the airplane and the motor car because it thought it was in the business of running trains rather than that of providing customers with transport.

ECONOMIST: Guru

The company also is developing four-wheel-drive technology that powers two wheels with an internal combustion engine and two with an electric motor, eliminating the need for a drive train that takes up floor space, Ho said.

NPR: China's Struggling Automakers Jump On SUV Boom

Home Of: Bentley Motor CarsFamous For: Hand-stitched leather, exotic wood hewn by carpenters into glossy veneers, excellent train accessHow to get there: Fly into London Heathrow, spend the night in the city, then take a train through the countryside toward Cheshire County.

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