I finally got my two challengers last night and gave each a quick test. My UP 3985 seems to work fine. The greyhound has some issues:
When running in command mode, the headlight flashes like the command signal is weak. There is a clicking noise coming from the front drivetrain somewhere, there is an occasional spark that comes from above the rear truck where something is shorting to the chassis, there is something going on with the valve linkage on one side of the rear drivers where it appears to catch on something causing it to jump up and down in it's guide. Finally, it will not run in conventional mode unless the oddesy switch is off.
Not too happy about that list of problems from a brand new loco
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