The majority of modern electrification systems take AC energy from a power grid that is delivered to a locomotive, and within the locomotive, transformed and rectified to a lower DC voltage in preparation for use by traction motors.
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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.
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.
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.
A train engine requires about a hundred litres of fuel to get it started. So it wouldn't be economical if the engine is stopped and started frequently. This apart, if the engine is stopped, the moving parts' lubrication will also come to a halt.
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.