建议加两个站点，一个建筑火车的，一个多出来的物品（没有交付完）回到仓库的。
（Suggest adding two stations, one for building trains and one for returning excess items (not yet delivered) to the warehouse.）

Not delivered yet

Not delivered yet

you can deal with excess items in the depot (add an inserter and a chest for every wagon). That's why there is a five second inactivity delay when entering the depot.

LTN, at this point, is pretty much complete. With the updates to use the schedule API, you can now keep your interrupts if you want to. Any other change would require a major rewrite of the internals and I am with @optera here that this is better a new implementation than trying to shoehorn it into LTN as is.

Wrong situation

• Wrong situation, so some items were returned to the garage
  

normal

• Normally, it should be like this, sometimes the situation mentioned above may occur