In most modern forms of locomotive technology, DC power remains at the top of efficiency and cost-effectiveness.
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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.
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.
Modern locomotives are air conditioned but many older ones are not. Individual freight cars may be refrigerated or heated, depending on the needs of what they carry.
It all comes down to efficiency; electric motors are far more efficient than internal combustion engines when it comes to creating mechanical energy, and this is particularly relevant with trains.
Some London Overground trains are air conditioned, others are air cooled depending on what unit you travel on Only the four 'sub-surface' Underground lines have air-conditioned trains. All new Class 345 trains - now running through the centre of London, have air conditioning.
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.
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.