Im surprised justin u would guess, considering u made a engine spec for a SD45-2 engine 58-19 gearing witch has a starting point 1.94m/s to 40.68m/s = 89MPH.
Uh, if I think what he means is right, he's asking about what the gear ratios are for the GP7, GP9, GP18, SD7 & SD9's on the platform. Since different railroads bought different ratios, he'd need to specify the railroad and the exact configuration of the model and what product it is.
That'd be a question for Wearsprada, since he made the Geep and SD models.