jiayang_0.1.1a_beta.zip is a beta file of the Minecraft data pack The last narrow-gauge steam locomotive, made for Minecraft 1.12.2. It was published on August 26, 2024 and is 35.1 MB in size. Pre-release builds can contain bugs — back up your world before installing. For the full description, screenshots and every other version, visit the The last narrow-gauge steam locomotive data pack page.
How to install: Put the .zip into the datapacks folder of your world (.minecraft/saves/<world>/datapacks) and run /reload. No mods needed.