Main line

Rarity: Common

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Notion

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Science and technology

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What Wikipedia says

The main line, or mainline in American English, of a railway is a track that is used for through trains or is the principal artery of the system from which branch lines, yards, sidings, and spurs are connected. It generally refers to a route between towns, as opposed to a route providing suburban or metro services.

Excerpt from the Wikipedia article “Main line (railway)”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Petr Štefek, CC BY 2.5, via Wikimedia Commons.