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I dunno...

A diesel/electric locomotive uses what is called a "dynamic brake" where the traction motors (the electric motors that directly drive the wheels) are re-wired through a series of relays and switches to work as generators with the main alternator of the locomotive providing the field current.

As the traction motors operating in braking mode create electricity it is sent to the dynamic braking grids (think super duty toaster wires) and converted to heat.

The system works really well on the newer locomotives, you can basically stop a train without using air actuated train brakes(the kind of brakes each car in the train is equipped with)!


--
Al G.

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