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Both overhead wire and third-rail systems usually use the running rails as the return conductor, but some systems use a separate fourth rail for this purpose. In comparison to the principal alternative, the diesel engine, electric railways offer substantially better energy efficiency, lower emissions, and lower operating costs. Electric ...
In this system, the current is mainly carried between the overhead line and a feeder transmission line instead of the rail. The overhead line (3) and feeder (5) are on opposite phases so the voltage between them is 50 kV, while the voltage between the overhead line (3) and the running rails (4) remains at 25 kV.
Overhead Line Electrification for Railways. "Network Rail A Guide to Overhead Electrification Revision 10" (PDF). Network Rail. February 2015. "On board with electrification". Permanent Way Institution Journal. 139 (1). January 2021. ISSN 2057-2425 – via PWI. Boocock, Colin (1991). East Coast Electrification. Ian Allan. ISBN 0-7110-1979-7.
The third rail system resulted, not surprisingly, in a number of accidents. It also resulted in a decree from the Connecticut Supreme Court on June 13, 1906 forbidding the use of third rail electrification within the state. [2] The New Haven was forced by this decision to design their main line electrification system using overhead catenary.
Overhead Line Electrification for Railways. "Network Rail A Guide to Overhead Electrification Revision 10" (PDF). Network Rail. February 2015. Boocock, Colin (1991). East Coast Electrification. Ian Allan. ISBN 0-7110-1979-7. Semmens, P.W.B. (March 1991). Electrifying the East Coast Route: Making of Britain's First 140m.p.h. Railway.
An overhead line or overhead wire is an electrical cable that is used to transmit electrical energy to electric locomotives, electric multiple units, trolleybuses or trams. The generic term used by the International Union of Railways for the technology is overhead line . [ 1 ]
Overhead Line Electrification for Railways 6th edition. "Network Rail A Guide to Overhead Electrification Revision 10" (PDF). Network Rail. February 2015. "On board with electrification". Permanent Way Institution Journal. 139 (1). January 2021. ISSN 2057-2425 – via PWI. Boocock, Colin (1991). East Coast Electrification. Ian Allan. ISBN 0 ...
From 1928 to its abandonment in 1940, the narrow-gauge Boston, Revere Beach and Lynn Railroad was operated with overhead electrification. The railroad shut down in 1940, and portions of it were used for the MBTA Blue Line which opened in 1953, although it used an entirely new electrification system and is operated as part of a subway system.