Is your feature request related to a problem? Please describe.
I think it's not a problem, but now the freight system is almost useless.
我认为它并不算一个问题，但是现在的货运系统确实没什么用。

Describe the solution you'd like
Now 1 train can carry 1 inventory grid of items.
It will be much better if the number of grids can be 27 or more.
It really made me crazy when I saw a train could only carry 1 lava bucket.
现在一辆列车只能运送一格物品栏的物品。
如果格子的数量可以变为27格或更多，那将会变得更好。
当我看见一辆列车只能运送 1 个岩浆桶的时候，这让我很抓狂。

Additional Information
(It can also be an option that adding a new freight train.)
(新增一辆货运列车也是一个选择。)

Each train can hold one stack per car, so simply make the train longer and have more carriages.

Each train can hold one stack per car, so simply make the train longer and have more carriages.

Thanks for your answer. It works.