Regenerative breaking on MMM

[VintageMA]

You may want to consider looking into how regenerative braking is performed on trains and subways. Ya know that burst of heat you feel coming from a subway is from the motor being used as a generator and dumping it's load through huge resistor banks. Then there are some systems where the generated energy is dumped back into the grid.

There may be more documentation available out there on how this is done - and much easier with a brushed motor (as mentioned) - then with a BL one.