Courtesy of the Bonneville Power Administration.
No date.
Note the fellow with the Fuller-Kinyon vacuum in the doorway, sucking out all the cement powder into the tanks in the background. This car was formerly used for lumber loading, stick by stick, as the small door on the right end shows. After being used for cement service, I doubt it was used for anything else.
Note one of the fellows on the right is pointing at the photographer.