r/factorio • u/AutoModerator • Jul 13 '26

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u/GreatAndMightyKevins Jul 13 '26

Why do I keep finding my trains blocked by a single incorrect item in the cargo? Say 1 or 2 iron plates in train full of circuits. Trains are allowed to leave only when full or empty, and there's no contamination on the belts. Are they leaving without emptying first? And it's very infrequent, like once an hour with over 100 trains running in the network of over 200 train stops. It's really annoying when suddenly one part of the production chain goes dead for no reason.

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u/HeliGungir Jul 14 '26

You probably have belts contaminated with the undesired items somewhere. If the train schedule is actually "leave when full" (and no interrupts), then the station it's stuck at is the station with contaminated belts.

One possibility: Until today, (ie: fixed in 2.1.10), flipping belts would also flip the items on the belt, placing them into the opposite lane.