Problem with Atlas Y turnout

[RobertInOntario]

Rob
Atlas track has been made to NMRA standards since time immemorial -- at least the 50s, probably the 30s. British manufacturers came up with their own ideas. There were BRMSB standards for "scale" modellers, but TriAng were toys. Hornby Dublo weren't sure.
The ideal solution would be to spread the wheels by a mm -- my Princess has a back to back of 13.5 mm while my b2b gauge is 14.5. But this gives 1mm of slop in the wheels. Also moving the wheels is beyond my skills. You might still find the flange jamming in the frog -- happened with some old all-rail switches.
Stick to Peco code 100 for this set of rolling stock.

Interesting. Thanks for this info, David.