DescriptionNBC Chimes used on Baltimore and Ohio trains 1938.jpg
Photo from an article about the B&O using the NBC chimes to call passengers to meals at the request of the radio network from the Baltimore and Ohio railroad's employee magazine from August 1938.
Because all pages of this magazine weren't able to be viewed, a copyright renewal search was done for the years 1965 and 1966 for periodical renewals for the Baltimore and Ohio. Nothing from the railroad was located. While it's likely the magazine was never copyrighted, I will license it as copyright not renewed to be certain.
Note that it may still be copyrighted in jurisdictions that do not apply the rule of the shorter term for US works (depending on the date of the author's death), such as Canada (70 years p.m.a.), Mainland China (50 years p.m.a., not Hong Kong or Macao), Germany (70 years p.m.a.), Mexico (100 years p.m.a.), Switzerland (70 years p.m.a.), and other countries with individual treaties.
{{Information |Description=Photo from an article about the B&O using the NBC chimes to call passengers to meals at the request of the radio network from the Baltimore and Ohio railroad's employee magazine from August 1938. |Source=[http://www.ebay.com/...