Center-tower gear-reduction and 1:1 gearboxes with symmetrical skew-cut gears (back-driveable) on axles were used to advantage by the late, great Doug Cockerham in his diesel rebuilds. My CLW unit has a dual-shaft motor with flywheels driving a sprocket chain tower at each truck. It has worked without fault for a good many years thus far and does not appear to be over stressed.
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