I scored a few train tracks

I got a great deal on some old train tracks and a vintage box! I'm really excited because I already have the freight rail runner (4564) at home, but I could never build a large layout before since the tracks were just too expensive. By pure chance, I also got most of the 7730 set in a bulk lot I'm currently sorting for a friend:) Don‘t know yet how to handle the old traks though. they seem quite used. is there difference between blue and gry? how are they powered? submitted by ...