How to Install?

1. Go to Mods/update/update.rpf/common/data/levels/gta5 and turn on edit mode and drag the files there. 
   (Option 2) Mods/common.rpf/data/levels/gta5 
2. (Optional) Drag traintracks.xml to the same folder from Option 2.

3. Train Files and Liveries (Optional)
Mods/x64e.rpf/levels/gta5/vehicles.rpf and drop them there.