Civil+War+Era+Train+Pack.zip is a release file of the Minecraft resource pack Civil War Era Train Pack - IR, made for Minecraft 1.12. It was published on December 21, 2019 and is 4.2 MB in size. For the full description, screenshots and every other version, visit the Civil War Era Train Pack - IR resource pack page.
How to install: Put the .zip into .minecraft/resourcepacks (do not extract it) and enable it under Options → Resource Packs.