The capacitor on the DCC ready tender were cut and the locomotive that came with it was working great with a Digitraxx DH123p plugged in. I wanted to see if this DCC ready locomotive would run if I switched the tender used the Bachmann DCC installed tender. When I did and powered the track the display on my Zepher started flashing with partially formed characters streaming across the screen. I then switched the tender to the one that has Bachmann DCC & Sound and everything worked fine. I had assumed that it was the tenders that controlled things and the locomotives could be interchanged. I'm not losing sleep over this as everything works great when I leave the locomotives with their respective tenders, I just found it curious that DCC installed tender caused the problem and the DCC/ Sound installed tender ran fine using the same locomotive that came with the DCC ready tender.