1. You must have Minecraft Forge
2. You must have the mod downloaded
3. You must place the downloaded mod rar file in the “mods” directory of your Minecraft Client. Typically it is as follows (—/appdata/.minecraft/mods).
For server support you must include the downloaded package in the “mods” folder of your Forge Minecraft Server.
Credit to BlazeAxtrius for makes this Expanded Rails Mod