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Athearn Diesel wheel size?

2855 Views 1 Reply 2 Participants Last post by  shaygetz
I have Athearn BB GP38-2, GP50, SD-40-2 from the late 1980's and a F7A non-flywheel version. What size are the drive wheels, 42" or 40". I have them all apart to polish the wheels and to replace some gears. I assume that the 8 wheels that are larger go in the F7A.

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