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Why don't American frieght trains use these?

Their dynamic brakes generate a lot of electricity. Which is then dissipated as heat. Why not instead use that waste energy to run electromagnets and get more braking force?
Awwwww shit boy I get to talk about my favorite locomotive.
But yeah it's most likely wear on rail that would occur from it's constant use and it still generates a stupid amounts of heat. The Japanese EF63 used them to slow down going down usui pass. Pic related. If you have a chance to go to the usui rail park you can even drive one of these bad boys.
>Why don't American frieght trains use these?
You need electrification.
Increased complexity + not sure how beneficial they would be on heavy freight trains
It would use the electricity from the dynamics and diesel.

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