dynamic braking

noun Railroads.
a braking system used on electric and diesel-electric locomotives in which the leads of the electric motors can be reversed so that the motors act as generators, offering resistance to the rotating wheel axles and dissipating kinetic energy, thereby retarding the locomotive.

Origin:
1925–30

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
Some of the proven systems are counterweight safeties, electrical dynamic
  braking, and a pneumatic rope brake system.
Braking is accomplished by dynamic braking, by use of the automatic brake, and
  by use of the independent brake.
The third test used the service air brake and dynamic braking but did not use
  the emergency brake.
Dangerous robot movement is arrested by dynamic braking systems rather than
  simple power cut-off.
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