BR650-2.0.zip is a beta file of the Minecraft resource pack [IR/Immersive Railroading] DB BR 650/RS1, made for Minecraft 1.12.2. It was published on October 21, 2022 and is 23.8 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 [IR/Immersive Railroading] DB BR 650/RS1 resource pack page.
How to install: Put the .zip into .minecraft/resourcepacks (do not extract it) and enable it under Options → Resource Packs.