New engine head a unit only powered unit seems to be off on mph when I run it side by side with PRR 4-6-0. Seems to be not up to speed on scale mph? I cleaned the wheels. I'm pulling 9 60" passenger cars with alot of turns and only one 16ft straight run. Could it be the motor or wheel slip. The prr 4-6-0 is pulling 3 freight and 5 50' Madison cars and seems to be running alot faster at the same scale speeds. I can hear the A unit laboring more. Any ideas. It didn't seem to do that when I first got it. Has about 600 scale miles on it and the 4-6-0 has about 1800 miles on it and seems to run smoother and not laboring like I the F3 A powered unit? The catalog number on the SF ABA IS 30-20158-01 Rail King 3 engine at 1 powered A unit and B and A rear units are dummies?
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