I have gargraves and atlas track some ross switches and I have several O scale two rail cars running and have no problems. I have several two rail brass locomotives converted to three rail with rollers and all I had to do was sharpen the frog on the atlas switches. I don't have derail problems and I even run a 6-8-2 brass steamer that has had very little modifications. I don't have the round tube rail on my layout and the smallest curve on the main is O-63. Oh I also run 20 plus car trains. Hope that helps. Bill
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