No, the boost/buck is applied through two relays just to the incline blocks. And yes, there is a momentary bridge as the rollers traverse from the normally powered block to the incline block. Of course, that also happens with multiple trains running on the same loop as they traverse from a normally powered block to a "holding" block, which receives enough voltage to maintain the E-unit direction, but not enough to power the motor. A resistor in series with the voltage applied to the "holding" block limits the max current there because there could be a significant voltage difference at that transition.
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