What are the axle lengths of Bachmann's HO scale #42903 and #42904 wheelsets?
Did you conduct a Search? I recall the Bachmann or Yardmaster giving this (or similar info) to Austrian, a few months ago.
Yes, I have searched the Bachmann site and the Internet in general. All I found was references to the axles in question being longer or shorter than other axles, etc. - but no actual length data.