Why do trains use high voltage?

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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As you know 25kV is globally accepted voltage level for electric locomotives. Reasons to choose 25 KV instead of 240/415V is that for less voltage like 240V or 415V, flowing current increase to dangerously high value and counductor/Line could be burnt out.

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If main line railways are operated with direct current, therefore, they generally use a higher voltage of 1,500 or 3,000 V compared to trams and electric narrow-gauge railways with their regional networks (600 to 1,200 V).

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If you touched the live third rail and any one of the others, or to the ground, yes. It's not only at a high voltage, but it's also DC which has the effect on your muscles of clamping on so you can't move. At least AC is at zero Volts every so often... But between the two normal rails probably not.

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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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Electric trains generally draw power from AC overhead lines. Some DC lines do exist, but they are getting replaced by AC lines. Motors used (traction motors) are generally DC motors.

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Engines may be left idling to maintain important safety related functions such as maintaining engine temperature, air pressure for the brake system, the integrity of the starting systems, the electrical system and providing heating or cooling to a train's crew and/or passengers.

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One of the primary reasons railroads use distributed power is to increase the pulling power of the trains as the length and weight also increases. By placing additional locomotives in the middle or at the end, the overall pulling power of the multiple locomotives increases, moving the train efficiently and effectively.

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All the carriages in the train are air-conditioned, seats are comfortable and positioned so that each passenger has a leg rest and far more space than on the plane - and also can freely throughout the train. A feast for the eyes is provided outside the large windows, as you admire the scenery of America passing by.

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Their speed, however, will be limited by the complexities of the 457-mile route, which is old, curvy and carries a mix of freight, commuter and intercity trains. Most Amtrak trains travel between 110 mph to 145 mph in the corridor, depending on the track and proximity to stations.

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Following are the advantages of alternating current over direct current: AC is less expensive and easy to generate than DC. AC can be transmitted across long distances without much energy loss, unlike DC. The power loss during transmission in AC is less when compared to DC.

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The Association of American Railroads opposes electrification due to its high capital costs.

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