B - Operations – Transporting – 61 – L
Patent
B - Operations, Transporting
61
L
B61L 1/18 (2006.01) B61L 3/24 (2006.01) H04B 3/00 (2006.01)
Patent
CA 2187567
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. The track circuit includes a track segment of preset length which is electrically isolated from adjacent segments by electrical splices at opposite ends thereof. The electrical splices each comprise 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 has axially-extending branches arranged along internal sides of corresponding rails. The track circuit comprises a stationary ground transmission unit and a stationary ground reception unit for each track segment, and corresponding on-board mobile reception units on trains in transit along the track. The stationary ground transmission units transmit data to and receive data from the on-board units through the rails of a corresponding track segment when a train travels on the corresponding track segment. Each track segment is connected to a compensation network comprising a plurality of capacitors connected to the rails of that track segment. Transmission of the data by the stationary ground units takes place at an audiofrequency range frequency, and using Minimum-Frequency-Shift-Keying modulation/demodulation; the data being coded as digital signals. The track circuit further comprises six transmission/reception channels for transmission and reception of data, each of those channels having a different carrier frequency and an identical preset bandwidth. The six transmission/reception channels comprise 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.
Bachetti Vittorio
Carpanelli Maurizio
Giovannucci Andrea
Regazzi Alberto
Alstom Transport S.p.a.
Marks & Clerk
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