Therefore , the traction motors impose drag and the locomotive acts as a brake .
Ultimately , the source of the energy dissipated in the dynamic braking grid is the motion of the locomotive as imparted to the traction motor armatures .
The traction motors impose drag and the locomotive acts as a brake .
Ultimately , the source of the energy dissipated in the dynamic braking grid is the motion of the locomotive as imparted to the traction motor armatures .