GB1344184A - Railway track circuits - Google Patents
Railway track circuitsInfo
- Publication number
- GB1344184A GB1344184A GB1344184DA GB1344184A GB 1344184 A GB1344184 A GB 1344184A GB 1344184D A GB1344184D A GB 1344184DA GB 1344184 A GB1344184 A GB 1344184A
- Authority
- GB
- United Kingdom
- Prior art keywords
- circuit
- signal
- amplifier
- track
- filter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- HDDSHPAODJUKPD-UHFFFAOYSA-N fenbendazole Chemical compound C1=C2NC(NC(=O)OC)=NC2=CC=C1SC1=CC=CC=C1 HDDSHPAODJUKPD-UHFFFAOYSA-N 0.000 abstract 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
- B61L1/00—Devices along the route controlled by interaction with the vehicle or train
- B61L1/18—Railway track circuits
- B61L1/181—Details
- B61L1/187—Use of alternating current
Landscapes
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Mechanical Engineering (AREA)
- Train Traffic Observation, Control, And Security (AREA)
Abstract
1344184 Track circuit BRITISH RAILWAYS BOARD 22 June 1972 [11 May 1971] 14207/71 Heading B7N In a track circuit for a continuous rail system in which the circuit ends are defined by short circuit elements 13 and in which the circuit is centre fed from a low frequency (400-1000 Hz) source 10, the ends of the circuit are more clearly defined using further high frequency (60 KHz) track circuit signals. Signals from the low frequency source are picked-up in the absence of a train, by pick-up coils 14 at the ends of the circuit and applied to a unit 15. In each unit the signal is applied via a filter 16 and amplifier to a modulator 17 where it modulates a high frequency carrier from source 18. The modulated signal is applied to the track at a distance from the shorting element 13 at which satisfactory shunting of the L.F. signal by a train can be guaranteed. This H.F. signal is picked-up by pick-up 19 and applied via a filter 20 and amplifier 21 to a demodulator 22 which supplies the demodulated low frequency signal via a filter, amplifier and rectifier to the relay circuit 24. As a further safe-guard the power supply to the amplifier for the received high frequency signal can be obtained via rectifier 25 from the received L.F. signal.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1420771 | 1972-06-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1344184A true GB1344184A (en) | 1974-01-16 |
Family
ID=10037003
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1344184D Expired GB1344184A (en) | 1972-06-22 | 1972-06-22 | Railway track circuits |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1344184A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2479763A1 (en) * | 1980-04-04 | 1981-10-09 | Vysoka Skola Dopravy Spojov | TRACK CIRCUIT HAVING MULTIPLE SIGNAL SOURCES |
| GB2208449A (en) * | 1987-08-05 | 1989-03-30 | M L Engineering | Track indicator apparatus |
-
1972
- 1972-06-22 GB GB1344184D patent/GB1344184A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2479763A1 (en) * | 1980-04-04 | 1981-10-09 | Vysoka Skola Dopravy Spojov | TRACK CIRCUIT HAVING MULTIPLE SIGNAL SOURCES |
| GB2208449A (en) * | 1987-08-05 | 1989-03-30 | M L Engineering | Track indicator apparatus |
| GB2208449B (en) * | 1987-08-05 | 1992-03-18 | M L Engineering | Track indicator apparatus |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PLNP | Patent lapsed through nonpayment of renewal fees |