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Old Athearn F Units
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I have a number of old Athearn F Units which I have detailed and love to run in the background on through trains while I switch the local, etc. No matter how clean I keep the track and the wheels on these F's, they soon start to spark. I read somewhere that this is called "arching" and that these sparks pit both the wheels and the track. Is this true? I don't want to pit the track and make it harder to keep clean, but I love the old F Units. The sparking doesn't otherwise bother me.
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