TREADLE

Treadle

In railway signalling, a treadle is a mechanical or electrical device that detects that a train axle has passed a particular location. They are used where a track circuit requires re-inforcing with additional information about a train's location, such as around an automatic level crossing, or in an annunciator circuit, that sounds a warning a train has passed an exact point. The important difference between a treadle and a track circuit is that while a track circuit detects a train over a distance as long as several kilometres, a treadle provides pin-point detection.

The above text is a snippet from Wikipedia: Treadle (railway)
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treadle

Noun

  1. A foot-operated pedal or lever that generates circular motion.

Verb

  1. To use a treadle.


The above text is a snippet from Wiktionary: treadle
and as such is available under the Creative Commons Attribution/Share-Alike License.

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