This is a add-on for the Mod Immersive Railroading, you will need this mod for it to work. you can find the mod here : https://www.curseforge.com/minecraft/mc-mods/immersive-railroading
This pack has a low poly count doe to it's voxel models, so it works well with low end computers.
you can find the other packs that goes well together here:
current content:
early age high speed train and tender
RESOURCE PACKS FOR IR ARE MC-VERSION AGNOSTIC!.
LICENSE: All rights reserved ... Nobody is allowed to duplicate, re-upload/redistribute or edit anything without the written permission of the owner.