I just installed a Digitrax SDN144K1E sound decoder into a N scale Kato C44-9W.
I used a Digitrax speaker(10 MM X18 MM ) which I mounted under the decoder at the rear of the loco. I also removed the supplied 100uF capacitor and replaced it with two 100uF surface mount caps wired in parallel. The problem is I can’t get the shell to fit down at the rear.
After looking real good I found that the loco’s exhaust stack was hitting the decoder. So I removed some of the boss material on under side of the exhaust stack inside of the shell to make some room. Now the small clip that holds the front of the radiator to the shell is hitting the decoder. If I remove the radiator I can get the shell on. If I remove the clip I would have to glue the radiator to the shell to hold the front of the radiator down to the shell.
Any one ever do one of these installs?
Thank in advance.