This is a Massive Duper for the 4 types of rails and for each type 1.96 Million are produced. You can generate the 4 types at the same time but unless you have a NASA PC I don't recommend it lol.

It comes with an automatic blue shulker crafter that fills the Shulker Loaders and also has Chunk Loaders to keep the area loaded while using the Duper.

It also has a Bulk with 6 columns of chests for each type of rail allowing to store millions of items in shulkers.