An air dump car such as those pictured is preserved in our collection at Portola.
Here is a bonus pic, also graciously provided by Brent of another WP 0-6-0, this time the number 158, performing it's day to day activities switching industries in what is likely Oakland or San Francisco:
The brakeman, oblivious to the photographer, walks a bit ahead of the movement. Scenes like this were commonplace, and I am sure very little of what is pictured remains. The 158 and sister 156 were sold in May of 1951 to U.S. Gypsum in Gerlach, Nevada. Both returned to the Bay Area for scrap in 1955. -JCA