on most postwar transformers, including the ZW, the voltage comes on at about 6 volts. The reason for this is to get the e-unit to operate before the locomotive starts to move. If your locomotive is not working this way, try cleaning the e-unit plunger with a contact cleaner spray solvent. One reason for this problem is that someone oiled the plunger. The e-unit plunger should never be oiled.
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