Unusual steam

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I was just watching a youtube video on N&W articulateds. At about 24:19 there's a scene with a Y-class running by itself with a large amount of steam coming from what appears to be the center of the tender. What would that be coming from there?
Norfolk & Western Articulated Steam Locomotives in the 1940's-1950's

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Norfolk & Western Articulated Steam Locomotives in the 1940's-1950's

Vintage railroad film of the Norfolk & Western articulated steam locomotives from the 1940's and 1950's. See Cla...
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Roger HuberDeer Creek Locomotive Works
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