The interlocking works with the track circuits and point detection.

Damage to the electrical wiring for signals and track circuits.

The trip are is proved at normal (red) in the track circuit following that signal.

However, she was known on the track circuit as unusually withdrawn and sullen.

However, at the time track circuits were relatively new, and its widespread introduction that soon may have been expecting too much.

If part of the train is left in the section, that part will continue to be detected by the track circuit.

The system makes use of track circuits for train detection.

Greene, a 20-year-old newcomer who was unknown on the track circuit until last winter, took second place.

With two signal protection, only one track circuit is needed between successive signals.

It is one of the last major oval track circuits to still compete on dirt tracks.