Why do trains use 25 kV?

The choice of 25 kV was related to the efficiency of power transmission as a function of voltage and cost, not based on a neat and tidy ratio of the supply voltage. For a given power level, a higher voltage allows for a lower current and usually better efficiency at the greater cost for high-voltage equipment.



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A 25 kV AC traction system has several advantages compared to other traction systems, such as: Reduced power loss: The higher voltage reduces the power loss during transmission, which means that more power can be delivered to the locomotive or train.

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For mainline and high-speed railways with long distances between power supply substations, overhead line electrification is often the preferred choice. The ability to transmit high-voltage power efficiently and support longer trains makes it a suitable option for these applications.

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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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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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High voltage has higher potential energy than low voltage. Low voltage has lower potential energy than high voltage. High voltage is typically used to power large devices, while low voltage is usually used to power smaller devices.

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In 25 kV AC system, the current drawn is less so the voltage drops which are mainly due to reactance of line are also quite less. Thus, there is great saving in the substations, i.e. in the 25 kV AC system, the longer distances between two sub-stations can be provided.

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For mainline and high-speed railways 25kV ac is now the most proven and widely used system. It offers a number of advantages, including reducing the cost of power supply equipment, improving efficiency, and using energy from braking more effectively which are all potentially attractive features to metro operators.

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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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Most overhead railway cables carry a voltage of 25,000 volts (25kV) in order to power electric trains. This is roughly 100 times more powerful than the electricity used in your home.

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1. Switzerland. Tucked inside the small but incredibly beautiful country of Switzerland is one of the most efficient and scenic rail networks in the world.

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“When traveling by train, the security and boarding are much faster and simpler, the luggage limitations go away, and there's easily twice as much leg room on a train even in the lowest class. You don't have to worry about the size of your liquids or whether your bag fits a certain dimension to carry it on.”

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