As soon as more than 1 inserter starts filling a train car there's a chance each of them will start a new stack.
When using a smart loader to load precise counts of items it becomes very obvious and often gets loading stuck even with normally 2 free stacks, see picture below.
- 2016-11-30-17-25-49-0017126.jpg (39.67 KiB) Viewed 2500 times
