Railcraft 12.1.0-beta-8 is on curseforge for over 3 years. But since beta versions are more untested, when I'm working on a modpack, I have to use 12.0.0 for stability.
But 12.0.0 also have some serious bugs so I had to write addon mods to patch them. So will 12.1.0 finally have a stable release for modpacks to use?

Use this patch mod with beta version
As for the main project, we need to wait for the author online to release it