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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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.
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.
How fast are high-speed trains in Italy? High-speed trains in Italy can reach speeds of up to 400 km/h (248 mph). The fastest Italian high-speed train reaching that speed is the modern Frecciarossa 1000, which connects the main cities, including Turin, Milan, Florence, Rome, Naples and Salerno.
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.
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.
High-speed-trains usually run on 25,000 volts alternating current (AC), but a few countries operate trains above 200km/h with other voltages, such as 15,000 volts AC in Germany, Austria and Switzerland. Some sections of high-speed lines in Italy and Russia use 3,000 volts AC.
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.
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.