WHile I agree with Trainman to about having sound professionally installed, or better yet factory installed, i need to ask who leaves a plastic shell laying around near a hot soldering iron? That defies common sense. I have no problems installing DCC in a locomotive. Most are now plug n play anyway, and adding DCC is as simple as plugging in a decoder. DCC with SOUND is a whole other level of complexity. That's a distinction that needs to be made in any discussion about DCC.