IMPERIAL RAIL WORKS V1.1b is a release file of the Minecraft resource pack Imperial Railworks - Immersive Railroading, made for Minecraft 1.12.2. It was published on November 20, 2023 and is 235.6 MB in size. For the full description, screenshots and every other version, visit the Imperial Railworks - Immersive Railroading resource pack page.
How to install: Put the .zip into .minecraft/resourcepacks (do not extract it) and enable it under Options → Resource Packs.