What is the power supply for trains?

Railways and electrical utilities use AC as opposed to DC for the same reason: to use transformers, which require AC, to produce higher voltages. The higher the voltage, the lower the current for the same power (because power is current multiplied by voltage), and power loss is proportional to the current squared.



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DC motors are used on trains is because of their high torque and good speed control. Compared to AC motors, DC motors can provide industry applications with a fine balance of strong starting torque and controllable speed for seamless yet precise performance.

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Overhead line equipment (OLE) refers to the overhead wires and supporting infrastructure that carry electricity at 25,000 volts to power electric trains.

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A large diesel engine turns a shaft that drives a generator which makes electricity. This electrical energy powers large electric motors at the wheels called 'traction motors'. To make a diesel electric locomotive power system it takes mechanical, electrical and control engineers.

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Certain electric traction systems provide Regenerative brakes. The energy generated by the train is converted into electricity and return it to the power system that is available to be used by other trains, or to the utility grid in general.

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The batteries are charged via the pantograph either when running under an overhead electric supply or at a specially built recharging facility.

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An electric locomotive is a locomotive powered by electricity from overhead lines, a third rail or on-board energy storage such as a battery or a supercapacitor.

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Europe's first trains to use batteries as a main source of power have arrived. Hitachi Rail announced last week that 20 tribrid trains—nicknamed “Blues”—are now running on rail lines across Italy. The trains have the ability to switch between battery power, electricity and diesel.

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The engine for maglev trains is rather inconspicuous. Instead of using fossil fuels, the magnetic field created by the electrified coils in the guideway walls and the track combine to propel the train.

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Historically, the 110 V battery located in the main locomotive was the source of dc power for most electrical rail applications. This meant providing light to the carriages required running cables along the full train length.

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Railway electrification in Great Britain began in the late 19th century. A range of voltages has been used, employing both overhead lines and conductor rails. The two most common systems are 25 kV AC using overhead lines, and the 750 V DC third rail system used in Southeast England and on Merseyrail.

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As with internal combustion engines that are used in more traditional ways, engines used as power generators in diesel electric trains are also considerably more efficient thanks to the use of turbochargers.

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In our world, a catenary is a system of overhead wires used to supply electricity to a locomotive, streetcar, or light rail vehicle which is equipped with a pantograph. The pantagraph presses against the underside of the lowest overhead wire, the contact wire.

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