Third rail
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 Third rail at the West Falls Church Metro station near Washington, D.C., electrified at 750 volts. The third rail is at the top of the image, with a white canopy above it. The two lower rails are the ordinary running rails; current from the third rail returns to the power station through these. |
A third rail is a method of providing electric power to a railway train, through a semi-continuous rigid conductor placed alongside or between the rails of a railway track. It is used typically in a mass transit or rapid transit system, which has alignments in its own corridors, fully or almost fully segregated from the outside environment. In most cases, third rail systems supply direct current electricity.
- Related: Conduit current collection, Fourth rail, Ground-level power supply, Linear motor, Rubber-tyred metro, Stud contact system, Third rail (model railroading)
| Thomas Edison's third rail patent (1882) Thomas Edison's third rail patent (1882) patimg1.uspto.gov/.piw?Docid=00263132&PageNum=2&idkey=NONE - Web |
| Lightrail without wires Lightrail without wires trb.org/publications/circulars/ec058/15_02_Swanson.pdf - Web |
| Details Details homepage.ntlworld.com/russelliott/3rd-4th.html - Web |
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| The "third rail" The "third rail" www33.brinkster.com/iiiii/inventions/3rdrail.asp - Web |
| Morrison-Knudsen 1992 Morrison-Knudsen 1992 sonic.net/.../e75-095.html - Web |
