So to follow this up I ended up coming up with a solution to the volume issue. I moved the RailSounds board from the powered unit to the dummy A unit. Doing this I had room to mount a 8 ohm, 1 watt, 2.25" speaker with a baffle made from a spray paint can lid. Then I marked the location of the speaker and drilled holes in the floor of the dummy unit to let the sound out. This resulted in MUCH improved sound volume. The sound output is now on par with my other factory Railsounds and PS2 locomotives.
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