I agree D500. I have the WM Scale Challenger and it is stunning as well as WM #6 Shay. I also have the Premier H9 2-8-0 and a Rail King 2-8-8-2 with numerous other locos and early era diesels.
My Pride & Joy is my Weaver Gold Line 4-6-2 Pacific in number 202 which is the number of the static display locomotive at the City Park in Hagerstown, Maryland. I have 9 MTH Western Maryland 70ft Passenger Cars to go with it. It makes for one beautiful train!
Hopefully one day MTH or Lionel will make a Potomac... 3rd Rail are you listening also...