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AssigneeSasib Railway S.p.A.
InventorsVittorio Bachetti, Maurizio Carpanelli, Andrea Giovannucci, Alberto Regazzi
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A track circuit is used in a railway plant or the like, and comprises a track segment which is isolated electrically from the adjacent segments by electrical splices which consist of a conductor connecting the rails in the shape of an "S" laid flat in the direction of the axis of the track. Stationary ground transmission and reception units we provided for each track segment, and on-board mobile reception units we provided on the trains in transit. The data or the information transmitted by the ground units to the on-board units being conveyed through the rails of each isolated track segment when the train is travelling thereon. According to the invention, with each track segment there is associated a compensation network consisting of capacitors connected to the rails of the track segment and suitably spaced apart. Particular embodiments are provided of the electrical splice and of the transmission/reception units.
A track circuit for a railway system including a track formed by rails, having a longitudinal axis and comprising a plurality of successive track segments, said track circuit comprising a track segment of preset length which is electrically isolated from adjacent segments by electrical splices at opposite ends thereof, said electrical splices each comprising a splice conductor connecting the rails together at opposite ends of each track segment and having an "S" shape laid flat and extending along the longitudinal axis of the track, each splice conductor having axially extending branches arranged along internal sides of corresponding rails, said track circuit further comprising a stationary ground transmission unit and a stationary ground reception unit for each track segment and corresponding on-board reception units on trains in transit along the track, said stationary ground transmission units transmitting data to, and receiving data from, the on-board units through the rails of a corresponding track segment when a train travels on said corresponding track segment, each track segment being connected to a compensation network comprising a plurality of capacitors connected to the rails of that track segment, transmission of the data by said stationary ground units taking place at an autofrequency range frequency and using Minimum Frequency Shift Keying modulation/demodulation, and said data being coded as digital signals, said track circuit comprising six transmission/reception channels for transmission and reception of said data, each of said channels having a different carrier frequency and an identical preset bandwidth, said six transmission reception channels comprising a first three transmission reception channels for transmission/reception on a track associated with a first train travel direction and a second three transmission/reception channels for transmissions/receptions on a track associated with a second, opposite train travel direction.
Dependencies are inferred from the claim text.