were the earlier run OMI brass diesel loco's DCC ready? [ yr. 2000 run]. probably didn't have a quick-plug. thanks, mike.
Does it have a can motor; or, an open frame Pitmann type motor. If a can motor you should be able to drop a decoder in there and be fine.
NP 2626 "Northern Pacific, really terrific"
Northern Pacific Railway Historical Association: http://www.nprha.org/