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I can say that their Dash 9, AC4400, SD40-2 and SD40T-2 will handle 18in radius - I have run them on Hornby 3rd radius curves which are about 18in and they were ok, though they would behave better on more gentle curves - I only used this circuit for testing purposes. I did find that replacing the metal strip across the top of the motor (that carries power from the trucks to the motor) with fine, flexible wire helps with both trackholding and reliable current collection - it seems to give the trucks more freedom to move. Hope this helps!
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