The electric drives that railroad locomotives have provides the same "variable ratio" effect that truck or tractor's mechanical transmission provides. A mechanical multi-speed transmission to withstand the 5000+ horsepower of a locomotive engine would be highly impractical so the generator/motor system is used. However, these components are very expensive and would be cost-prohibitive in smaller machines where the mechanical transmissions are simple, effective, and efficient.
Replacing hydrostatic drives with electric generators and motors has been studied in an effort to improve efficiency while maintaining the speed range flexibility. Back when diesel fuel was $4+ per gallon this made some sense but with our current fuel prices the added product cost can't be offset by fuel savings. Replacing mechanical transmissions with electric drives provides no efficiency benefit (actually, it would usually be a loss) so in this case there is nothing to offset the added cost.
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Today's Featured Article - Talk of the Town: Winterizing Engines - To Drain or Not to Drain? - by Russ Berry. What is this strange attraction I have to equipment and machinery? How did I get this way? I came from the suburbs and own a small horse farm in rural Loudoun County, Virginia. You can call me a "weekend farmer." The local farmers do. Does it bother me? No. I am just happy to have their friendship. At least the word "farmer" is in my title. But what is the attraction? How can I explain the sensation and exhilaration I feel when I turn the key and hear the engine come to life (most
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