Not sure you’ll get many replies to this, at least in the short term, as I doubt if that many have been sold yet, let alone converted. I would take out an axle of each sort of wheel, measure the wheel diameter, and look up the corresponding Alan Gibson wheelset. Going by other Bachmann ventures, I guess you will not be able to pull out the Bachmann wheelsets: the bogie widths would probably not permit the wide Bachmann flanges. This is purely speculation on my part! I have no access, or money, to the breakdown train.