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Re: R-42 Retirement Run

Posted by Train Dude on Thu Feb 13 17:39:13 2020, in response to Re: R-42 Retirement Run, posted by Bill from Maspeth on Thu Feb 13 13:28:35 2020.

Similar but not quite. In downshifting you are just using the forward motion of the car to turn the engine and that slows the car.

In dynamic braking, you actually rewire the motor into a generator and then use the trains forward momentum to turn the generators to produce electricity which is either dissipated under the car through a resistive load or the generated electricity can be fed back into the 3rd rail to help power other trains.


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