Do trains use AC or DC current?

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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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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DC will consume less energy when operating under service conditions. The equipment in the system will cost less to build and there is no need to produce the conversion technology to ensure that the train can run on AC power.

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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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Also, Metro's tunnels tend to be deeper than those in most other cities because of the area's topography (kind of swampy). This means they're longer than most escalators. The longest, at the Wheaton (Md.) station is 230 feet long.

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