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Track spacing is usually expressed as centerline to centerline distance. Typically something around 15' on prototype standard gauge tangent track. For modeling, this roughly calculates to:

1:32 scale: ~5 5/8"
1:29 scale: ~6 1/4"
1:20 scale: ~9"

You don't mention your scale or whether standard gauge or narrow gauge equipment, but using your 2" dimension between the inside rails, the centerline spacing would be ~3 3/4". I'm certain that would be too close for all but the smallest narrow gauge equipment.

Happy RRing,

Jerry
 
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