I just received my first train for X-Mas. It's a Pennsylvanian (set) #90026. I have been reading Model R-R and Garden R-R to get some idea of what is going on. I still have ?'s and no answers. First Is Garden R-R and Large Scale the same? 2nd What guage is the track? Is it in inches or is it metric? Narrow or std. guage? 3rd What is the Radius for this train set? Any and all help will be appreciated .DMC