Thanks Hunt & Jim... the hum (and it is LOUD...) does not start when I turn on power, or when I select Forward or Reverse, but it starts the second that I increase the throttle handle. It occurs at crawl speed thru fast speed with no change in volume or pitch.

The only thing I can compare it to, is I had a 0-4-0 that was DC, and before I installed a DCC decoder in it, I ran it once as a DC engine on my DCC layout, and it really howled (bad hum)... so I didn't do that any more.

This one has me stumped, as it sounds like a bad ballast in a florescent light fixture...  any advice would sure be appreciated.

Bob

I just received a new Bachmann Spectrum 4-4-0 "Richmond" that I purchased from MicroMark. The locomotive makes a terrible humming noise when I turn on power on my Digitrax Zephyr. The unit is item 83401, with DCC On Board. The noise occurs both in forward & reverse, and starts at a "crawl speed" thru faster speeds.

Can anyone please offer a suggestion? 

Bob   

Thanks for the info...  Bob

Has anyone installed a sound decoder in the Spectrum 4-4-0

If so, can you please share info on the installation.

Thanks...