Is Athearn part # 40028 the same as part # 40019 (except for quantity)?
I think they are. Both are 40" wheels with gears and doing a quick google search it seems the only difference is quantity.
I should have added that the Proto 2000 “Tune Up Kits” are the same thing as well. If you can’t find the Athearns you can use the Proto’s as an option.
Thanks. I was assuming that it was a packaging difference.