1. Open/install OpenIV
2.Choose your version you want to let the wagon on the rail roads
3.Copy your update.rpf to your mods folder
4.Enable "Edit mode" inside OpenIV
5.ADD the trains.xml to \mods\update\update.rpf\common\data\levels\gta5\ inside the update.rpf by Drag&Drop into the OpenIV window.

OR (Alternative installation)

1. Open/install OpenIV
2.Choose your version you want to let the wagon on the rail roads
3.Copy your common.rpf to your mods folder
4.Enable "Edit mode" inside OpenIV
5.REPLACE the trains.xml file inside \common.rpf\data\levels\gta5\ with the trains.xml file of the "Add To Railroads" folder.
