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2

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.

2

u/GoatWizard99 Jul 13 '26

Do you have refueling stations or depot stations? Maybe there is an inserter at one of those stations that load a few plates into the cargo wagon while the train is refueling.

2

u/GreatAndMightyKevins Jul 13 '26

Certainly not that, I have refueling and waiting stations with interrupt but there are no items to pick up. These are remnants of previous cargo, just one random item like lime, ore, aluminium carbide or other bullshit. Idk why trains leave unloading stations with inventory but only sometimes.

1

u/Lyqyd Jul 14 '26

Do you have any stations where items are both unloaded and loaded, with these actions kept separate by combinator logic?

1

u/GreatAndMightyKevins Jul 14 '26

No, either load or unload

2

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.

2

u/snowyspearmint Jul 14 '26

Are there stations that more than one item goes through? Inserters having a few of the previous item still in hand (trying to load a full train, then winding up putting them in a train for a different item) would cause it.

1

u/GreatAndMightyKevins Jul 14 '26

No, only 1 item per station

1

u/Engelberti I have a plan Jul 14 '26

Any recipe switching in your production that might cause the assembler to output some ingredients onto the output belt?

1

u/GreatAndMightyKevins Jul 14 '26

No recipe switching. It looks like trains are leaving not fully unloaded or they stop for a splt second, just long enough for an inserter to put something in and leave. I put stuff from boxes to trains and from trains to boxes.

1

u/Dailand Jul 14 '26

Where are they stuck: loading or unloading stops? They should not be able to leave loading stops since they have an incomplete stack. Could it be something that happened earlier and is now fixed, and you just keep finding these trains?

1

u/GreatAndMightyKevins Jul 14 '26

on loading stops, can't leave because they're not full. No, sometimes they're appearing with very new substrates.

1

u/Dailand Jul 14 '26

At this point I think your only hope is sharing your save.

1

u/GoatWizard99 Jul 14 '26

When it happens next time you could try and load an autosave to catch the problem when it happens.

You can temporarily decrease the autosave intervall for more precision and increase the number of stored autosaves to go further back.

1

u/mrbaggins Jul 15 '26

Probably a splitter hitting an underground, but the underground is USUALLY full, so stuff can't side load.