The problem I had with Atlas 54/72 curved turnouts was on large wheelbased steam. Premier Atlantics and Pacifics went through the diverging route o.k., but almost anything larger derailed. The engines would ride up on the guard rails due to the length of the drivers and derail.. RailKing engines and diesels with their shorter wheelbase went through just fine. It got to be so aggravating that I removed the offending turnouts. I have every intention to try some Ross turnouts in the future. The templates I have for Ross turnouts show a much wider and longer path. The design seems to be much better, but they take up about 15 to 20% more space and the middle rail seems to be have much better contact with the roller especially through the frog. The manufacturers don't have the strict guidelines that the NMRA sets for HO, and the three rails for O gauge, while they simplify some problems, (i.e., wiring), they amplify others.
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