DRGW_rollingstock_pack.zip is a release file of the Minecraft resource pack D&RGW Narrow Gauge Rolling Stock Pack - IR, made for Minecraft 1.12.2. It was published on July 13, 2018 and is 19.2 MB in size. For the full description, screenshots and every other version, visit the D&RGW Narrow Gauge Rolling Stock 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.