What takes a lot of replacing?
I looked again, it looks like the BG vehicles have wheels like a car similar to those vehicles used to transport people around Hollywood sets, maybe they were made for invisible tracks with no traffic roads as, "ballast."
Does look nice overall.
If you are using TS2009 and want to try updated rails, someone has rail-only track on DLS either s301 (has standard and broad gauge) or hupfgeign (standard and narrow though I forget the width) last I knew, maybe Pencil42 if you want lighter rail weight.