Crossposted from the "Steam Era Freight Cars" (STFMC) YahooGroup, here are some photos of helium cars at the Library of Congress site.
These were taken by Jack Delano who is well known as a documenter of railroads during the World War II era-- when officially, pictures of railroad activities were frowned upon if not downright illegal.
I think these shots illustrate how good the A1G model really is, not only for its time but against current offerings as well.
Cheers,
George (your list-owner)
