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B-B vs. A-1-A
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[quote]QUOTE: <i>Originally posted by beaulieu</i> <br /><br />The A1A truck is not only needed for carrying the heavier weight of the passenger locomotive but also had less tendency to hunt at high speeds. All EMD E-units were built with 36 inch wheels, while all F-units were built with 40 inch wheels. This alone gives the F- units more TE from the greater leverage of the larger diameter. <br />The lowest gear ratio installed on a E- unit from EMD is the same as the highest ratio installed on a F- unit. A few E- units (notably those of E-L) later received freight gearing and larger wheels. <br />[/quote]It isn't the larger wheel diameter that gives a higher tractive effort, it is the lower gearing. A larger driving wheel actually lowers the T.E., just as it does on a steam loco.To compensate for this leverage effect, on a steam loco, the piston stroke would be lengthened, on a diesel loco the axle mounted gear would be larger, or the drive gear smaller, to give a lower gear, to raise th T.E..
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