Factorio Forums

Entities "Loader" and "Fast loader" should have field "next_upgrade" in prototypes set to the next tier, respectively "fast-loader" and "express-loader".

Source: https://github.com/wube/factorio-data/b ... 1047-L1158

No.

With current restrictions put onto upgradable entities, since loaders are not used by the base game the items that build loaders are all hidden, and if next_upgrade would be set it would throw a prototype stage error due to items being hidden.

weird