Great setup, but I don't know if I like the second one better.... a bit too warm, but strikingly powerfull light, IMHO.
Also, I don't think the track displacement should be inverted; they should be totally different, as they are not like the wheels' rubber. I would also mask out the stones in the tracks' path, as they wouldn't be dented. And in bends, there should be a second and maybe even third set of tracks traversing the others, depending on the number of axles in line.
I hope you get back to this.