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When a steam engine with the Zimo decoder stops, the chuffing ceases and a steady stream of smoke will occur. My guess the issue is the engine stopping, the smoke is a non issue.
 

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Which do we assume, engine stopping or just the chuff steam stopping? If smoke is F6, then cv 132 needs to be 72 for steam, and cv 137 to 139 are the 3 levels of smoke output. Plus cv 351-355 are for chuff control.
 
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