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It is called a funnel ( you're talking about the thing that spurts out smoke right?)

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Or chimney. - The other large excrescences on locomotives like that in the heading photo are the "dome", which collects the steam and houses the 'regulator' (UK) or throttle (US) valve controlling its flow to the cylinders, and I think a sand-box. That holds sand that can be fed to the rail-head just in front of the wheels to overcome grease and give the driving-wheels grip to help in starting.

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9y ago

What else can I help you with?