A rather late reply to this but I've only just read it. Yes I have fitted an LS and Massoth mini power buffer to an LGB steam tram loco. By shaving away about a quarter of the material from the top of the weight located in the boiler it is possible to get them both out of sight inside the boiler. That left me wondering where to hide the speaker. Since I never look at the running loco when from below or even on the same level it is possible to remove the top of the boiler dome boiled egg style. By great fortune the diameter of the dome is just right to glue a Visaton 28mm speaker horizontally and facing up with enough clearance for the sound to 'escape' without being unduly muffled by the roof. The combination of the Massoth sound file and the small speaker means that the volume won't shatter any wine glasses but it isn't too loud on the real thing snuffling along either judging by a video of one at a gala on the CFBS . Losing any weight from an LGB loco has an effect on its haulage capacity but it still manages un train mixte of 4 four wheel vehicles on the level and up a 3% gradient but the 4% one tests it severely. It is probably possible to replace the loss by fixing a couple of bits of thin roofing lead inside the exterior panelling without wrecking the visuals but I haven't bothered. Long trains isn't what it's for and it looks and sounds right with a Fourgon and three four wheelers pottering up the line in the middle of the high street in the town diorama in my garden set up. I wondered about heat dispersal inside the closed boiler when things got hot last summer but there didn't seem to be any adverse effects.
I hope this inspires somebody else to have a go. It is almost underwhelming because there is no change in the appearance but the chuff, whistle and bell sounds make it all worth while.
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