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Connection rules

Coal mines, roads, and the unpublished link

Checked 15 October 2026 · version notes for Roblox V0.1 where they apply

Original illustration of trucks and industry, not a verified game layout

Confirmed versus not published

Searchers want a diagram: coal mine, road, coal factory, power plant, with distances. I can defend the road. I cannot defend a distance. A machines page on a community wiki states that players are trying to connect the coal-fired plant to mines and that the connection rule is not published. I am treating that sentence as the center of this page, not as a gap to paper over.

ClaimStatus
Mine output leaves by roadConsistent in guides
Coal feeds power and the steel chainConsistent in guides
Plant-to-mine connection ruleNot published
Tile radiusDo not use a number
Mine cap 10 then 12Community observation only

What I would try in the client

Inspect road access and the receiving building input panel, utility warnings, staffing and queue. If coal still does not arrive, record the warning and current requirements rather than assuming a vehicle cap or an invisible pipe rule. Rebuilding closer is not a verified fix.

Original city-building illustration, not an in-game screenshot

Questions

How do I connect the coal factory to the coal mine?

Put both on the road network and use trucks. A direct building-to-building pipe rule has not been published. If your client shows a connection tool, follow that tool, not a tile count from a guide.

How many mines can I place?

A community patch note says the cap moved from 10 to 12. That is an observation, not an API field.

Why is the coal mine full and the plant empty?

The road or the truck is the first check. The unpublished plant-link rule is the second. See the five truck checks before you rebuild the mine.

Sources checked 15 October 2026

This guide is for the Roblox experience. Looking for the mobile Empire City game?

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