@BobbyD posted:GREAT WORK!!
I believe the issue is MTH wanted all their cars to go around at least O42 or less curves? Amazing that K-Line 21" cars are closer coupled than these. I have some Lionel F units where the gap must be 1" or more.
Thanks.
I would agree that they were built to be able to negotiate much tighter curves so spacing sacrifices had to be made.