Thanks for the info . I think that Bachmann had problems with these units with disintegrating cast chassis, thei one I had 5 years ago was replaced under warranty, this one they told me to join this group and try to find one.  Looks like I have n upper chassis with motor and a DCC tender for sale

I need a bottom chassis for an HO 2-8-0, the one with 2 screws to hold it together The cast chassis broke right at the back wheelset . NB this is the second one like this where the chassis was broken. Trenton Model Train Repair