(19)
(11) EP 0 165 048 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
09.11.1988 Bulletin 1988/45

(43) Date of publication A2:
18.12.1985 Bulletin 1985/51

(21) Application number: 85304144

(22) Date of filing: 12.06.1985
(84) Designated Contracting States:
DE FR GB IT SE

(30) Priority: 13.06.1984 GB 8415025

(71) Applicant: M.L. ENGINEERING (PLYMOUTH) LIMITED
 ()

(72) Inventor:
  • Cross, Peter John
     ()

   


(54) Railway track circuit equipment


(57) Track circuit equipment is provided in which the transmitter of each track circuit uniquely identifies its transmissions by impressing an associated data word (38) onto its transmission using frequency shift keying. The track circuit receivers are so arranged that in order to output a track clear signal, a receiver must first have detected on incoming signals a data word (38) identifying the transmitter belonging to the same track circuit as the receiver. Each data word (38) is included in a message structure that also provides a start sequence (35) and a parity section (39). The data word (38) includes respective bit groups providing longitudinal and lateral location information on the related transmitter. Each data word (38) may also include a bit group providing for an auxiliary signalling function such as track-to-train signalling.






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