The third rail is usually located outside the two running rails, but on some systems it is mounted between them. The electricity is transmitted to the train by means of a sliding shoe, which is held in contact with the rail.
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Today, most trams use electrical power, usually fed by a pantograph sliding on an overhead line; older systems may use a trolley pole or a bow collector. In some cases, a contact shoe on a third rail is used.
Electric railways began in Great Britain in 1883 and the first EMU ran on the Liverpool Overhead Railway in 1893. In the early 20th century, systems were developed where all the motors on a train could be controlled by a low voltage signal from any cab.
Railway electrification stands at about 37 percent of the global track length in 2018 (based on International Railway Union [UIC][1] data); this percentage has been growing over the last two decades by amounts that vary widely from year to year.
Contact wire is generally built in zig-zag to reduce the wear on pantograph slide. When the train is running at a high speed, the contact wire has to face the extreme working environment such as vibration shock, temperature difference, environmental corrosion, mechanical friction, and arc ablation [48].
The maximum speed currently possible in the UK is 186mph, achieved by Eurostar trains on the HS1 line between London and the Channel Tunnel. The HS1 line is used by Eurostar services and Javelin commuter services from Kent, although the latter have a max speed of 140mph.
TIL Rats and birds don't get electrocuted by the third rail because they don't form a grounding connection. This is not some property inherent to rats and birds. This is because when they touch the third rail, they aren't touching anything else.