This mod changes what Trains are hauling, There are a few freightcars that have been removed and new ones added for now there are only 2 variations of train spawns and one metro train change.
a long oil train, and a double engine no freightcars setup.
The metro train is now much longer with 8 cars attached.
This mod also makes all trains stop at staions like the mp ones do.
To install open update.rpf In openIV.
Navigate to data-levels-gta5 
Add in the two files to the gta5 folder this will overwrite common.rpf so no need to backups(if you want it gone delete the files form update.rpf.)
Close open iv.
Start gtav go to a train track to check changes to what they are hauling.
Also ive tested this with train driver scripts works perfect.
**If you experiance crashing on game start, Reopen common.rpf in openIV and Click file Rebuild.**