IsleStVerna.zip is a release file of the Minecraft resource pack Isle St. Verna Pack For Immersive Railroading, made for Minecraft 1.12.2. It was published on June 14, 2023 and is 91.2 MB in size. For the full description, screenshots and every other version, visit the Isle St. Verna Pack For 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.