Ok thanks for the reply, already got it working.
-Khang Lu, University of Minnesota Railroad Club
How old is this locomotive, and what type of decoder does it have?
Newer Atlas Master models with sound decoders don't have a jumper.
Some old Atlas locomotives that had their own brand of decoder did have a jumper that you had to move in order to enable DCC.
And after doing that, the address should be on 3, which is the standard factory default address.
The documentation that came with the locomotive should show you where the jumper is located, how to get to it, and what position to set it on for DCC.
If you don't have the documentation, here's a PDF copy of it.
http://www.atlasrr.com/pdf/4FncDecoder_Manual.pdf
How do you convert an Atlas Master loco equipped with DCC to DCC? Do you just move the jumper plug? And whats the default adress? Thanks