DaveMcW, can you explain how it's works, please? Tried to use it, but it didn't load fuel into locomotive.

Loewchen wrote:You can filter the wagon inventory to not allow fuel.

Yes, I know it, but sometimes I have misc stuff in wagons and empty slots and I do not want to filter it.

Is there any mod or method to set inserter configuration that it only insert stuff into locomotive fuel inventory but not into the other cells/wagons/chests?

I know, when your train is in automatic mode, and if any wagon stops near fuel inserter, it won't insert fuel into wagon, but in manual mode ...