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The original was posted on /r/factorio by /u/Sea_Supermarket_6816 on 2025-02-23 06:22:25+00:00.

For example, you have multiple trains loaded from a copper plate smelter, they then wait on holding platforms, then when one of your unloading stations gets low on copper it signals that train to depart?

Then I suppose, they unload until a satisfactory amount is reached at the station (rather than an automated full unload), then return to the pattern.

How is this done?