Greg, I was questioning the Atlas Custom Line series of turnouts in referance to there use of Mk2, Mk3 and Mk 4 terms. Current production is Mk 4 and according to Atlas there were minor changes but they are useable together. This is in the case of code 100 trackage. They only use the Mk4 term on the #6 in code 83. I was just asking for input from anyone else. Thanks for responding.
Wayne