what other manufactured brands of engines and rolling stock will fit and run on o gauge tubular track without any modifications
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Other than what?
Lionel, MTH, Kline, 3rd Rail, Williams, AMT, KMT, Kusan, Hornby, Bing, American Flyer, RMT, Atlas, Ives, Weaver, Marx, or something else? There are many others I'm sure.
Schilling is another. Mark
Here are some more.
Frank's Roundhouse
Industrial Rail
InterMountain Railway
Menards
Pecos River
RGS
Right-of-Way Industries
thanks for all the information---maybe I should have asked what won't run on o gauge tubular train
Well, the big thing that comes to mind is stuff like MTH scale wheeled 3-rail locomotives. When I had Fastrack and tubular track, they didn't like the rounded rail at all. No problem with Atlas or Gargraves/Ross track with the more square rail profile.
GRJ is correct. Scale MTH does not like Menards or old Lionel. Too round at the top.
@CurtisH posted:GRJ is correct. Scale MTH does not like Menards or old Lionel. Too round at the top.
I think you meant MTH scale locomotives with scale wheels (which have smaller flanges). Normal MTH scale locomotives (whether they are Scale RailKing or Premier) with the more common toy train wheels do just fine on tubular track … as long as the curves aren’t too sharp. 
