Athearn SD40-2 conversion
#28
If you bought the ATHearn 40" wheels you will have to adjust your coupler height.Iknow the prototype uses 40" but Athearns from the factory (at least the blue box ones like yours ) use 42".It may not seem like much in HO but it will cause a height problem.

About those original wheels ,they are cintered iron meaning they are made from a iron powder compressed into shape under pressure then basically baked to harden them.There is a video on You Tube showing how to polish these wheels which gives them the same finish as the newer wheels.But it reduces the pulling power somewhat.

My usual practice with the 6 axle Athearns is to use the new nickel silver wheels to replace the outer wheel sets but leave the inner wheel sets the original wheels. This way I have 4 nickel silver axle sets for picking up power but still have some of the tracktive effort of the original wheels.
Johnathan (Catt) Edwards
"The Ol Furrball"

"I'm old school,I still believe in respect"
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