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So I'm using the mod Automatic Coupling System to park wagons at stations and decoupling cargo/fluid wagons to be loaded/unloaded and sending the engines somewhere else. Cargo wagons are loaded/unloaded by inserters without a problem but fluid wagons won't be loaded/unloaded at all.

Removing and reattaching one of the fluid wagons parked at a station will make the pumps engage on all wagons. This might have to do with the Train ID changing. I know fluid wagons are special as they have to be exactly in the right spot for pumps to engage but since my wagons are parked automatically at the right spot it should work.

The behaviour is inconsistent with inserters/cargo wagons and IMHO should be changed to make pumps engage with fluid wagons in the right spot.

Thanks.

[Edit] Video of the issue:

[Edit] Video showing train is fully stopped:

jesta030 wrote: ↑

Sat Dec 17, 2022 9:34 pm

I know fluid wagons are special as they have to be exactly in the right spot for pumps to engage but since my wagons are parked automatically at the right spot it should work.

There is a special case for fluid wagon as you said but maybe you need more precisions : the train shouldn't have its front part on a curve. More precisely the curves introduces a very slight offset which is not always visible to the naked eye but still present even if the train park itself automatically, it creates fake right spot for fluid wagon placed after a curve, the track becoming straight again making it difficult to understand.

Could this be the case that part of your train sits in a curve ? or it be related to this ?

( https://www.reddit.com/r/factorio/comme ... cars_dont/ )

That almost looks like the train isn't actually fully stopped by the time the mod disconnects the fluid wagons and so they don't properly register as stopped. Although I haven't looked into it.

mmmPI wrote: ↑

Sat Dec 17, 2022 9:54 pm

Could this be the case that part of your train sits in a curve ? or it be related to this ?

I updated the initial post with a video involving only straight track.

To me that doesnt look like curve rails and my knowledge stops here

Rseding91 wrote: ↑

Sat Dec 17, 2022 9:57 pm

That almost looks like the train isn't actually fully stopped by the time the mod disconnects the fluid wagons and so they don't properly register as stopped. Although I haven't looked into it.

Hey thanks for the quick response!
I've added two videos to the initial post, the second shows the train waiting for 2 seconds before the engines leave the station. The pumps engange but then disengange when the engines leave while the fluid wagons are not full. I also checked train IDs and both the engines and the wagons get new IDs when the engines decouple/leave.

When I was using Automatic Coupling, I always put a "Wait for 0s" condition on stops that were meant to couple or uncouple. That way it's guaranteed to be registered at the stop for one tick. Coupling stops with no condition at all had unpredictable behavior.

So quick update, it does indeed appear to be related to the mod. I was made aware of a very similar mod called Signalized Couplers and although the mod appears to work exactly the same (trainIDs also behave the same) here it works:



@Rseding91 Consider this bug report closed, thanks again!