I think it was intended to have the rail car as a fast travel...but instead of "jumping to" destination..V can actually ride it (like the trailer showed) but CDPR didn't have time to finish that (or probably stopped working on it)........I know we can ride on top of the car (inside with a mod) but I'm talking about inside the train (part of base game/no mod)
maybe we'll get it during a update one day...what do you think?
maybe we'll get it during a update one day...what do you think?