Heavy haul freight railways predominantly employ continuously welded rail to provide the best rail construction suitable for high axle loads. The combination of increased cost and length limitations render AF track circuits economically impractical for application to lines designed for non-electrified freight traffic. Moreover, AF track circuits are more complex and expensive to build and operate than DC track circuits. More specifically, rail inductance typically limits lengths of AF track circuits to about 1 km, as compared to about a 5 km length limit for DC track circuits. AF track circuits do not require insulated joints, but are limited in length due to rail inductance. AF track circuits are also applied to electrified lines where DC track circuits do not work. The signal block sections are used to maintain a safe separation distance between trains.Īudio frequency (AF) track circuits are commonly used in metro signal applications, where shorter headways are required to support trains with shorter stopping distances. The track circuits are applied to define signal block sections, which are related to signal locations and fixed block train control systems. These variations to DC track circuits use insulated joints to isolate adjacent track circuits. There are many variations to DC track circuits, including coding to extend lengths and transfer signal information between trackside locations via rails. The most common type of track circuit used in non-electrified lines is the DC track circuit, which was invented in 1872 and is still widely used today. In addition, conventional AC coded track circuits are used for track-to-train communications of signal aspect data.
Description of Related ArtĬonventional train signal systems use track circuits for two basic functions: train detection and broken rail detection. Preferred and non-limiting embodiments are related to a broken rail detection system and method, and more particularly, to a broken rail detection system and method that utilize information from Communications Based Train Control (CBTC) systems on locations of trains in a train network to detect broken rails. BACKGROUND OF THE INVENTION Field of the Invention 61/828,902, filed May 30, 2013, the disclosure of which is hereby incorporated in its entirety by reference. Roma: CIFI, 2007, 316 p.This application claims the benefit of U.S. ETCS European Train Control System”, Development and implementation in Italy. W.Vantuono, “Control systems trains in USA”, International Raiway Journal, no.atika, svyaz' i informatika», Moskva, no. E.N.Rozenberg, V.A.Voronin, “Intellektual'ny'e sistemy' interval'nogo regulirovaniya”, Jurnal «Avvol.atika, svyaz', informatika: Nauchnopopulyarny'y proizvodstvennotehnicheskiy jurnal. Isklyuchenie proezda zapresch'ayusch'ego signala svetofora: novaya tehnika i tehnologiya E.N.Rozenberg Avvol.B.F.Bezrodny'y, B.R.Denisov, V.B.Kul'tin, S.N.Rastegaev, “Avtomatizaciya rascheta parametrov i proverka TRC”, Jurnal «Avvol.M.N.Vasilenko, B.P.Denisov, V.Kul'tin, S.N.Rastegaev, “Raschet parametrov i proverki rabotosposobnosti bessty'kovy'h tonal'ny'h rel'sovy'h cepey”, Problematika transportny'h system, Izvestiya PGUPS, no.P.D.Kulik, N.S.Ivankin, A.A.Udovikov, “Tonal'ny'e rel'sovy'e cepi v sistemah JAT: postroenie, regulirovka, obslujivanie, poisk i ustranenie neispravnostey, povy'shenie e`kspluatacionnoy nadejnosti”, Kiev: Izdatel'skiy dom «Manufaktura», 2004, p.D.A.Nijnichenko, “Sistemy' obespecheniya bezopasnosti dvijeniya vy'sokoskorostny'h e`lektropoezdov”, Jurnal «Avvol.YU.I.Polevoy, “Modeli rel'sovy'h liniy”, Monografiya Y.I.Polevoy Mvotrta RF, Feder.K.V.Goncharov, “Korrelyacionny'y putevoy priemnik tonal'ny'h rel'sovy'h cepey”, K.K.V.Goncharov, “Issledovanie cifrovogo putevogo priemnika tonal'ny'h rel'sovy'h cepey”, K.V.Goncharov Vi'snik Dni'propetr.V.S.Arkatov, “Rel'sovy'e cepi magistral'ny'h jelezny'h dorog”, V.S.Arkatov, A.I.Bajenov, N.F.Kotlyarenko, Transport, 1992, 384 p.R.M.Aliev, “Opredelenie optimal'ny'h parametrov bessty'kovy'h rel'sovy'h cepey s potencial'ny'm priemnikom”, Vestnik TGTU.“Aliyev Intelligent system of control of track circuits on high speed lines”, WCIS 2016, 9 World Conference on Intelligent Systems for Industrial Auvol. International Compendium, Editors: Gregor Theeg, Sergej Vlasenko.
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