Because no back of the card was shown, a search for original copyright registration was done in artwork (where postcards would be listed) for the year 1947. There were no listings pertaining to the railway or the train-there's no evidence of original copyright on the card.
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 (50 p.m.a.), Mainland China (50 p.m.a., not Hong Kong or Macao), Germany (70 p.m.a.), Mexico (100 p.m.a.), Switzerland (70 p.m.a.), and other countries with individual treaties.
{{Information |Description=Postcard for the first streamlined run of the Nashville, Chattanooga and St. Louis Railway train City of Memphis. |Source=[http://www.ebay.com/itm/MENU-Nashville-Chattanooga-amp-St-Louis-Railroad-034-City-of-Memphis-034-1940s...