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# 122 Yes, here is the very basic, simple rule that is normally true: Larger Driver Diameter = More Speed, Lower Tractive Effort Smaller Driver Diameter = Higher Tractive Effort, Lower Speed Of course, tractive effort and speed are determined by more than just driver size. Cylinder size, stroke length, boiler pressure, and a number of other things. That equation above is just what you can infer about a locomotive by looking at the divers.
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