Quick followup- turns out the Digitrax DN163A0 is the correct drop-in decoder for the later releases (2006 and beyond?) of the Atlas RS-11. Jamie
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I just purchased an N-scale Atlas RS-11 painted and lettered for Seaboard Air Line. They also hooked me up witha Digitrax DN163A2 decoder, which did not fit when I went to install it. I have looked on the Digitrax & NCE websites and do not see the RS-11 listed. Is there a drop-in decoder available for this loco? Jamie