Waste energy generated by braking is converted into electric energy by the traction motors and this is fed into the heater grids.
(Waste energy; generated; by braking) (Waste energy; is converted; into electric energy; by the traction motors) (this; is fed; into the heater grids)
Waste energy Waste energy this
generated is converted is fed
by braking
into electric energy by the traction motors
into the heater grids