Hi Dominic, Remember the starting voltage of a loco is directly related to track load. Adding lighted passenger cars and/or pulling heavier trains will most certainly calm them down.
Each transformer has its own starting volts. Specifically the starting volts on a postwar ZW is about 8v. At 8v an unladened Williams diesel or electric pattern loco will run too fast to couple cars smoothly. It will slam the car way too hard. At the same time when pulling a light load with the throttle at it's very lowest setting, the train will be too fast.
You cannot start it smoothly when running light due to the start up voltage of the old ZWs is so high. As soon as you crack the throttle the slightest, it's off too fast.
That is what we're talking about.
The rewire fixes that.
Very best, Don Johnson
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