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Volpedia/Games/Factorio/Trains/Rail chain signal
FACTORIO / TRAINS

Rail chain signal

Looks at downstream signal states and helps prevent trains from stopping inside critical junctions.

Original Volpedia referenceReviewed 2026-10-27Quick reference · noindexBASE / CORE SYSTEM
Original Volpedia editorial diagram, not an in-game machine screenshotOriginal Volpedia illustration
OverviewResources17Machines17Logistics17Power12Trains11Circuits12Research14Weapons13Maps12Modes8Enemies11Blueprints10Space Age14Progression12Guides22Tips12Tools2
Practical advice: Common rule: chain signal before intersections, rail signal after, adapted to the actual topology.
How it worksPractical adviceMistakes to avoidRelated
01

How it works

Looks at downstream signal states and helps prevent trains from stopping inside critical junctions.

02

Practical advice

Common rule: chain signal before intersections, rail signal after, adapted to the actual topology.

03

Mistakes to avoid

Using chain signals without providing a valid exit path, leaving trains blocked.

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Back to Trains
IN THIS GUIDEHow it worksPractical adviceMistakes to avoidRelated topics
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Every explanation is on Volpedia. An internal registry records research and version checks.

Volpedia is an independent fan reference, not affiliated with Wube Software. Factorio mechanics and recipes may change between versions, mods and base game versus Space Age. Content last reviewed October 27, 2026. Category illustrations are original Volpedia diagrams, not gameplay screenshots. Factorio trademarks belong to their owners. Research and provenance records are maintained internally.

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