Rheostatic Braking

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See [[dynamic_braking]].A braking system used by locomotives and trains fitted
with electric traction motors where the motors become generators and the current
developed is fed to on-board resistor grids.  The energy is dissipated as heat
as the grids cool.  Some grids have to be force-ventilated to dispose of the
heat quickly enough.  Rheostatic braking is useful for diesel-electric
locomotives with heavy freight trains on long down grades.