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@O-MATIX Not possible on both GTA V and even in GTA IV.

The FusionFix team in GTA IV tried it but it's simply not possible to change map models in-game.

@TCRL I never used the HD version and only a few people use it because it's simply too big + more unstable than the regular version.

The installation for the regular version in video form; https://streamable.com/98q3cj

From the description and readme;

[Singleplayer HD]
Not available due to different file structure; just use Ctrl + F3 and search .rpf with corresponding name, and replace the files inside of it.

@TCRL The installation is for the standard Singleplayer version only, as the Singleplayer HD version has completely different file structure. You have to use CTRL + F3 to search the entire mods folder to find the .rpf files.

@qiafanxu Vehicles has their own glass texture, so yeah, it's necessary.

@qiafanxu Yeah it's possible but good luck as that involves modifying all vehicles in the game.

@StarlightDX Yes as it replaces all windows.

@TOWUnderR Yeah the station coordinates can be adjusted, but I know nothing about them so didn't edit the tracks4.dat file.

@Xire It's the default texture but modified by myself to have different color.

I can't touch script mods because I have zero knowledge with scripting. Plus, the vanilla trains have no issues to begin with, unlike the tram which is extremely slow in the vanilla game.