In this video, I'm pretty much explaining on how I added 2 trains 2 tracks support for the improved trains mod I guess... enjoy this dumb video lol... (And no this isn't a tutorial by the way lol...)
now, this isnt exactly a tutorial, the way you access the train group and metro group is launch the OpenIV app and go to mods/update/update.rpf/common/data/levels/gta5 and if you want to view it, double click the "trains.xml" file, if you want to edit it, enable edit mode, right click the file, and click "edit" and yeah...
now, im not too sure if i will make a kitsune trains tutorial, since i dont have it installed, although i did download it, but im not too sure, so dont expect me to try make a tutorial or something