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Puff puff puff puff...


ConfusedRobotCat

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There is a number of ways to do this which have been about for a long time, and no need to risk freeze burns with dry ice.

 

Triang introduced smoke in 1961.

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Later some were fitted with Synchro-smoke with a piston driven by a gear inside the nechanism which puffed smoke from a smoke unit out of the chimney.  

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