Bowser and Mantua axle sizes + NWSL ?

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Are Bowser and Mantua axle shafts for steam locomotives the same diameter? I know Bowser axle shafts are 1/8th" but I am not sure about the Mantua shafts. The NWSL question pertains to the Mantua shafts. What NWSL gearboxes have you used on your Mantua Pacifics & Mikados?


Mark