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Sound is perfectly possible in N gauge used fixed common speakers although I couldn't vouch for the quality. Practically the sound would stay fixed in a certain position rather than mobile as with the larger scales. Using sound only decoders linked to speakers. Practically you would double head or consist a stationary sound decoder with mobile decoder in a loco to achieve sound. A 2.5 dia speaker is obtainable and this would give quite reasonable sound. The obvious problem is the sound would be constant and not fade with distance as with a mobile decoder. So you would have to experiment. You would choose a decoder that is programmable so that the sound could vary, for instance slamming doors in a station, a guards whistle, station announcer, and the engine it's self. I'm currently starting to experiment with a Digitrax SFX064 and their programmer with the objective of producing genuine British sound. This is a new product and there isn't a great deal of documentation available currently. I have all the hardware for programming this decoder. Over the next few weeks I'll be trying to get some results
from this combination.
 
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