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So this brings up an issue that has always puzzled me. Why don't you hear 4 chuffs per revolution? Since all these trains have two double acting cylinders there are 4 exhaust strokes per wheel revolution, and hence you should hear 4 chuffs. On the GS4 I can make out a pattern of 4 (the 4th beat is kinda soft), but on the Mike and the Duchess I only hear two. Same for my Berk - I only hear 2 beats per wheel revolution. Any idea why?

Oh, and to the original question posed by the thread - Memorex! Oh wait, we've gone digital...never mind.
 
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