Hi Jabor047
I got an error when adding your mod.
I really want to try this mod.
Thank you.

Failed to load mod: Error while running setup for entity prototype "express-underground-belt" (underground-belt): next_upgrade target (ultra-fast-underground-belt) must have the same fast_replaceable_group (transport-belt != underground-belt).

Hello, I believe the error does not stem from this mod, but is due to the rigid and static implementation of the original Belt Legacy mod. I recommended using this alternative instead, that should be more compatible with any and all mods that add higher tier belts (and confirmed it does work with this mod, no updates required)