The train in the PC and PS2 versions is a bit different — the PC version has more detail, but the PS2 version also has an advantage — the train is painted with graffiti all along its length. Taking the PC version as a basis, I carefully placed graffiti where they were in the PS2 version, while trying to preserve the PC level of detail as much as possible.
Mod Features:
PC detailed model (except for the outer side stiffeners, which seemed out of place on the sides with graffiti to me);
Graffiti textures from PS2 version.
Installation: move the 'graffiti train' folder to the modloader folder, if you have it, or add with replacement the contents of the 'graffiti train' folder into the gta3.img, if you don't have the modloader.