There are ore train cars that use regenerative braking on the way down the mountain, generating as much as 5x the power needed for the empty trip back up. Repo

There are ore train cars that use regenerative braking on the way down the mountain, generating as much as 5x the power needed for the empty trip back up. Reportedly, they power the mining town at the top of the mountain. https://en.wikipedia.org/wiki/Regenerative_brake#Conversion_to_electric_energy:_the_motor_as_a_generator https://en.wikipedia.org/wiki/Regenerative_brake#Conversion_...