This mod was uploaded to "gta5-mods.com" under the account "Walter". If you got it from anywhere else, you may have gotten a modified archive!
To install the addon, follow these steps:

PREREQUISITES:
All content you will need from this mod is inside the "Content" folder, and its relevant subfolders.

You will need an RPF manager to install content. I recommend OpenIV.

You will also need a custom "Gameconfig" mod, to increase DLC vehicle limits. Any one you fancy should do:
https://www.gta5-mods.com/search/gameconfig

You will also need the "HeapAdjuster" mod:
https://www.gta5-mods.com/tools/heapadjuster

and the "Packfile Limit Adjuster" mod:
https://www.gta5-mods.com/tools/packfile-limit-adjuster

Alongside all that, if you want to use the "mods" folder, you will need Script Hook V:
http://www.dev-c.com/gtav/scripthookv/

WARNING: Always work with the "mods" folder, never directly replace any game files!
WARNING: Do NOT launch GTA Online with modded files!
WARNING: Having "Overhauled Trains" installed WILL cause some slight compatibility issues!


Installing the new models:

1. - In OpenIV, navigate to "mods > update > x64 > dlcpacks"
	- If this folder doesn't exist, create it.

2. - Drag and drop the "trainsredux" folder into this "dlcpacks" folder.
	- You should end up with a path like "mods > update > x64 > dlcpacks > trainsredux > dlc.rpf"

3. - In OpenIV, copy the "update > update.rpf" archive into your Mods folder.

4. - Inside this archive, navigate to "update.rpf > common > data" and find a file called "dlclist.xml"

5. - Open this file in Edit mode, scroll to the bottom, and add this line:
	<Item>dlcpacks:/trainsredux/</Item>

6. - Save the file.


Installing the config files:

1. - Navigate to "mods > update > update.rpf > common > data > levels > gta5"

2. - Drag and drop the following files into this folder:
	trains.xml
	trains1.dat
	trains3.dat
	trains4.dat
	traintracks.xml


Installing the custom audio:
1. - In OpenIV, copy the "x64 > audio > sfx > RESIDENT.rpf" archive, and the "STREAMED_AMBIENCE.rpf" archive into your mods folder.

2. - In OpenIV, go inside the "RESIDENT.rpf" archive, find "vehicles.awc" and right click it. Select the option to "Export to OpenFormats (.oac)" and export it anywhere, then keep the exported location open. You should be left with a "vehicles" folder and a "vehicles.oac" file.

3. - Drag and drop all the files from the provided "vehicles.awc" folder in this mod into the newly created "vehicles" folder you just got.

4. - Drag and drop the "vehicles.oac" file back into "RESIDENT.rpf" in OpenIV.

5. - Repeat this process with "distant_train.awc", found in "STREAMED_AMBIENCE.rpf", to replace the distant ambient train horns.


Finally, enabling your custom content:
1. - In OpenIV, at the top, go to Tools - Asi Manager

2. - Enable the Asi Loader and OpenIV .ASI options.