I have two locomotives doing some really strange things.  One is a Spectrum light Santa Fe and the other a Standard Kanawha.  The Santa Fe is currently address 3, while the Kanawha has the cab number.  Right now on address three, the Santa Fe's sound system works, but the motor doesn't, while the Kanawha respnds to address three with motor but not sound.
To complicate things the programing track is acting up.  It claims the locos will not respond and when I try to program the Power Pax red light begins to blink. 
In addition, a Mike just back from Tony's made noise, but didn't answer the throttle, and now does nothing.   Other locomotives work fine. 
Gene

sounds like cv 29 is not properly set in all four decoders.

Gene

If the powerpax led is blinking it is telling you that there is a short or overload.

To reset remove power from the Powerpax for 30sec then re-apply.

What system are you using?

Can you read the decoder in any of your good locos on the programming track?

Tim L. Anders
Souderton, PA