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 - Seeing an Old Friend - by Joe Evans. Dad had a concrete contracting business starting in 1960. One of his first pieces of equipment was a Ferguson TO-35 with a Davis loader. Dad replaced the TO-35 with a MF 202 Workbull, essentially an industrialized Ferguson 35 I am told. Dad bought the 202 new in 1962, and I recall quite clearly going to the dealer with him to sign for it.
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