Hey i noticed that with Extraplanetary Production and Age of Production together, trains (locomotives, cargo wagons, and fluid wagons) aren’t craftable anywhere. After some testing, it seems to be caused by these lines in Age-of-Production.lua: compatChangeCategory("locomotive","pressing-or-electromechanics-or-crafting") and the ones for cargo-wagon and fluid-wagon (not sure about the artillery wagon didnt check in game but the recipe category is different so it should still work). Removing them seems to fix the issue.

Literally ran into this just before coming to check here - fix released shortly, after I try and make sure I haven't done the same for anything else.