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I would suggest using flextrack, so that you can make your curves as broad as possible. The UP was known for running the absolute largest locomotives they could get their hands on, and to do so required a mainline that was about as straight as a curve can be! I know you'll have to make compromises based on the space you have available, but with flex you could make just a part of the curve be sharp and then hide that in a tunnel or behind some scenery, and then broaden it out again where it is visible. If you are planning on running a Big Boy or Challenger, I suggest you experiment a bit with some flex to see just how tight a curve it'll run on, and what it looks best on.
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