Track circuit

Rarity: Common

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Notion

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Science and technology

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What Wikipedia says

A track circuit is an electrical device used to prove the absence of a train on a block of rail tracks to control railway signals. An alternative to track circuits are axle counters.

Excerpt from the Wikipedia article “Track circuit”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: American Railway Association, New York, USA, Public domain, via Wikimedia Commons.