Signalling block system

Rarity: Common

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Notion

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Science and technology

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What Wikipedia says

A signalling block system (or block system) is a safety mechanism primarily found on railways that is used to prevent trains from colliding. Block systems divide the track into fixed segments ("blocks") using signals, sensors, or other equipment, and one train may occupy a block at a time.

Excerpt from the Wikipedia article “Signalling block system”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Cjp24, CC BY-SA 4.0, via Wikimedia Commons.