| 21. | TI21 type track circuits ( now known as " EBI"
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| 22. | These track circuits are limited in length to about 300m.
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| 23. | She competed on the 2011 IAAF Diamond League track circuit and established herself further.
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| 24. | This upgrade will install signals, track circuits and automatic speed control ( ASC ).
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| 25. | Signalling and safety systems on both sections included track circuit and absolute block signalling.
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| 26. | If part of the train remains in the section, the track circuit detects that part.
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| 27. | Another factor in the accident was the failure of a track circuit in the area.
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| 28. | McGhee was a regular feature on the international professional track circuit in the late 1990s.
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| 29. | Automatic Route Setting, Automatic signal and track circuit failures.
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| 30. | The whole railway was resignalled by 2006 with track circuits replacing the treadle-operated signalling system.
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