Figure 2.14. Engine Starting Contactor.
Two types of voltage regulators are found on locomotives: the torque-motor operated and the
relay types. The torque-motor one, sketched in figure 2.15, is treated as follows: if discoloration or
sparking develops on the regulator commutator, clean the regulator as soon as possible. Inspect sector
and carbon rim assemblies and replace them if they are burned or worn. Check piston