Thanks for the great mod! I ran into a small issue with the Smart Rail System v2 blueprint book. For some reason fluid stations loading concrete mix are causing normal trains to be dispatched, not fluid wagon trains. They can't load the fluid and end up sitting idle blocking the station. Is concrete mix somehow not classified as a normal fluid in a way that would be incompatible?

As far as I know there is nothing too special about concrete mix, except that the maker of the blueprints may not have anticipated its existence. Do other modded fluids work correctly?

The author of the blueprints responded. The system uses a fluids whitelist to identify fluids, and modded fluids have to be added to the constant combinator at any depot. One snag I ran into is that when creating the signal and searching for concrete mix, it shows up in both the intermediate products and fluids tabs and they look identical. Initially I hadn't noticed this and chose the intermediate products signal and it didn't work. Switching to the fluids tab concrete mix signal fixed the issue.