Ray (and Stan) - have you considered getting a bluetooth speaker system? that has the obvious advantage of simply using your iphone or computer as the source. There are a couple of stereo BT systems on Amazon that look like they'd fit in a boxcar - or perhaps better yet, make them a flatcar or gondola load, which would make changing the batteries easier. I guess you could get fancy and figure out a way to power it up from track power.
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