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Posted by Train Dude on Fri Mar 3 20:53:40 2000, in response to Re: Once again (Was:Actually, R68s Are Better At Local Routes And R40s Are Better At Express Route,
posted by Dan Lawrence on Fri Mar 3 15:32:04 2000.
Dan,Perhaps this is losing something in the translation in Baltimore but I think you have it backwards. The pinion gear (on the motor shaft)is smaller than the bull gear (on the axle). On the R-40 it takes 7.2 rotations of the motor to turn the wheel one rotation. On the R-68 it takes 5.08 rotations of the motor to turn the wheel one rotation. Hence, unless all my years at subway university have been wasted, if the motor speed is the same, and the wheel size is the same, the R-68 should be faster at top speed although due to less mechanical advantage and more weight, slower on accelleration.
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