Extended Stack on Z

[NW Mailing List]

List, 

In a scene in “Operation Fast Freight” (on YouTube, and also available remastered for rent on Vimeo - https://vimeo.com/ondemand/filmsofthenandw <https://vimeo.com/ondemand/filmsofthenandw>), there is a short sequence of a Z switching what appears to be a chemical or petroleum plant. The locomotive has an extended stack. Was this common, and what was it’s purpose?  Better draft while switching? Better visibility? See the attached photo.

Matt Goodman
Columbus, Ohio, US

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