Air vents

[NW Mailing List]

In answer to my own question, and edification of anyone else who might be
interested, I am attaching a diagram that shows the workings of the Garland
air vent used on many passenger car roofs. I naively thought that the vents
would scoop air into the car as the train moved, but as you can see, they
actually use the scooped air to pull air from the interior of the car.
Learn something new every day, if you're lucky.
Jim Cochran
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