It depends on the type of high speed train. Traditional locomotives have combustion engines, which burn fossil fuels to power the pistons, to power the wheels, to drive the train. There is, however, a new kind of highspeed train called a maglev train (short for magnetic levitation) that works by completely different principals. Unlike a traditional locomotive, a maglev train does not have an engine at all. Rather , superheated electric coils create an electro-magnetic field. These magnetic field reacts with high-powered magnets on board the train to create magnetic propulsion. To read more about maglev trains, follow the following link.
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