The chimney (smokestack or stack in American and Canadian English) is the part of a steam locomotive through which smoke leaves the boiler. Steam locomotive exhaust systems typically vent cylinder exhaust through the chimney to enhance draught through the boiler. Chimneys are designed to carry exhaust steam and smoke clear of the driver 's line of sight while remaining short enough to clear overhead structures. Some chimneys included features to avoid dispersing sparks.
what comes out of a steam train funnel
smoke smoke smoke