Fourth Rail

Some articles on rail, rails, fourth rail, fourth:

London Underground Infrastructure - Electrification
... The Underground is one of the few networks in the world that uses a four-rail system ... The additional rail carries the electrical return that on third-rail and overhead networks is provided by the running rails ... A top-contact third rail beside the track is energised at +420 V DC, and a top-contact fourth rail centrally between the running rails is at -210 V DC, combining to ...
Railway Electrification In Great Britain - Existing Systems - Third and Fourth Rails - 650 V - 750 V DC, Third Rail
... Southern Electric The LSWR third-rail system at 660 V DC began before World War I from Waterloo to several suburban destinations ... LSWR system, and by 1929 the LBSCR suburban overhead network was replaced by third rail ... The third rail extended throughout most South London lines under Southern control (LBSCR and SECR), and then out of all its London termini ...
Railway Electrification In Great Britain - Existing Systems - Third and Fourth Rails - 630 V DC, Fourth Rail
... The Underground uses a relatively uncommon four rail system of electrification ... Two standard gauge rails are the running rails the outer third rail carries positive current at +420 V DC and the inner fourth rail is the negative ... The chief advantage of the fourth-rail system is that, in tunnels with a metallic (usually cast-iron) lining, the return traction current does not leak into the ...
Third Rail - Technical Aspects
... The third rail is usually located outside the two running rails, but occasionally between them ... the train by means of a sliding shoe, which is held in contact with the rail ... On many systems an insulating cover is provided above the third rail to protect employees working near the track sometimes the shoe is designed to contact ...

Famous quotes containing the words rail and/or fourth:

    We rail at trade, but the historian of the world will see that it was the principle of liberty; that it settled America, and destroyed feudalism, and made peace and keeps peace; that it will abolish slavery.
    Ralph Waldo Emerson (1803–1882)

    ... men and women are not yet free.... The slavery of greed endures. Little child workers, the hope of the future, are sacrificed to industry. Young men are sent out by the billion to die for profits.... We must destroy industrial slavery and build industrial democracy.... The people everywhere must come into possession of the earth [second, third, and fourth ellipses in source].
    Sara Bard Field (1882–1974)