Tim, thank you for the reply and the links to mrhmag. I will note that there is not two screws holding the middle of the frame but just one. I removed the shell again to make comparisons with the photos on mrhmag and decided to take the light board out of the top of the shell to see how much room I would have to shave off the frame so I put in an unused LM3 I had and to my surprise I could get the shell back on the frame without taking any material off the frame. This will work. While I don't like Bachmann's design on their locomotives this is certainly doable. I am not sure if Ring has a sound for a Fairbanks Morse Trainmaster, but it would be ashamed to not put a speaker in this model too. I like the Scale Sound Systems, but they do not have one for this particular model yet, simple measurements will get the right fit though. I still will have to grind out some of the frame in order to get the depth I need for a sizeable speaker baffle to sit in there but it would not need to interfere with that middle screw, thus keeping the frame integrity. It may be some months before I get to this one as there are several locomotives in line ahead of this FM H16-44 for Railpro conversions, I will document this and post the photos here.