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10ft. Radius, 20ft. Dia. will allow all engines including Brass Big Boys, etc.
If you're only running MTH 1:32 than 5 1/2 ft. Radius, 11 ft. Dia. will accommodate Dash 8 and 70ace Diesels with body mount couplers and all their steam engines plus small Brass engines. 57" rail height above the ground is the best viewing height.
 
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