Английский язык

Перевод текста.
power supply.
the electric railway needs a power supply that trains can receive at all times. it must be safe, economical and user friendly. it can use either direct current or alternating current, the formed being, for many years, simpler for railway traction purposes, the latter being better over long distances and cheaper to install but, until recently, more complicated for controlling a train.
transmission of power is always along the track by means of an overhead wire or at ground level, using an extra third rail laid close to the running rails. alternating current system always use overhead wires, direct current can use either an overhead wire or a third rail; both are common. both overhead systems require at one collector is to be attached to the train so that it can always be in contact with the power. overhead current collectors use a "pantograph", so called because that was the shape of most og them until about 40 years ago. the return circuit is via the running rails that are at earth potential and are connect to the substation.

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