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  2. Overhead line - Wikipedia

    en.wikipedia.org/wiki/Overhead_line

    The installation of overhead lines may require reconstruction of bridges to provide safe electrical clearance. [20] Overhead lines, like most electrified systems, require a greater capital expenditure when building the system than an equivalent non-electric system. While a unelectrified railway line requires only the grade, ballast, ties and ...

  3. Overhead power line - Wikipedia

    en.wikipedia.org/wiki/Overhead_power_line

    Overhead lines or overhead wires are used to transmit electrical energy to trams, trolleybuses or trains. Overhead line is designed on the principle of one or more overhead wires situated over rail tracks. Feeder stations at regular intervals along the overhead line supply power from the high-voltage grid.

  4. Dual electrification - Wikipedia

    en.wikipedia.org/wiki/Dual_electrification

    Dual electrification is a system whereby a railway line is supplied power both via overhead catenary and a third rail. This is done to enable trains that use either system of power to share the same railway line, for example in the case of mainline and suburban trains (as used at Hamburg S-Bahn between 1940 and 1955).

  5. Three-phase AC railway electrification - Wikipedia

    en.wikipedia.org/wiki/Three-phase_AC_railway...

    The overhead wiring, generally having two separate overhead lines and the rail for the third phase, was more complicated, and the low frequency used required a separate generation or conversion and distribution system. Train speed was restricted to one to four speeds, with two or four speeds obtained by pole-changing or cascade operation or both.

  6. Traction power network - Wikipedia

    en.wikipedia.org/wiki/Traction_power_network

    Traction current lines are not usually laid parallel to the railway line, so as to minimise the line length and to avoid unnecessary influences of electrical system near the railway line. However, there are cases where this practice is not followed (for example, the current supply of some rapid-transit railways operating with alternating ...

  7. 25 kV AC railway electrification - Wikipedia

    en.wikipedia.org/wiki/25_kV_AC_railway...

    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. Periodic autotransformers (9) divert the return current from the neutral rail, step it up, and send it along the feeder line.

  8. Symbolab - Wikipedia

    en.wikipedia.org/wiki/Symbolab

    Symbolab is an answer engine [1] that provides step-by-step solutions to mathematical problems in a range of subjects. [2] It was originally developed by Israeli start-up company EqsQuest Ltd., under whom it was released for public use in 2011. In 2020, the company was acquired by American educational technology website Course Hero. [3] [4]

  9. North West England electrification schemes - Wikipedia

    en.wikipedia.org/wiki/North_West_England...

    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 ...