RTR, my area of expertise really only consists of most of the track within a 50 mile radius of where I live. Beyond that, my knowledge gets fuzzier and fuzzier as the distance increases. I do know where all of the mainlines in and out of the area go for the 3 major railroads. This is due to the fact that I model the railroads in my area, so I'm fairly well versed. Knowing that detail within my area, allowed me to give that grade. I can only assume that they are equally accurate around North America, and for that matter the rest of the world.
I've got to check out Europe! Lots of cool trackwork in Britain and the continent. Passenger terminals are huge and complex.
