Postcard photo of the first trip of the "Painted Train" on the narrow gauge Durango and Silverton Railroad in Colorado. The painted train was an effort to promote the line for tourism which was successful enough to continue today.
While the first "painted train" trip took place in 1950, it appears that the railroad offered these postcards to those riding the train from that point to promote their service.
The card has no copyright markings on it as can be seen in the links above.
United States Copyright Office page 2 "Visually Perceptible Copies The notice for visually perceptible copies should contain all three elements described below. They should appear together or in close proximity on the copies.
2 The year of first publication. If the work is a derivative work or a compilation incorporating previously published material, the year date of first publication of the derivative work or compilation is sufficient. Examples of derivative works are translations or dramatizations; an example of a compilation is an anthology. The year may be omitted when a pictorial, graphic, or sculptural work, with accompanying textual matter, if any, is reproduced in or on greeting cards, postcards, stationery, jewelry, dolls, toys, or useful articles.
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 photo of the first trip of the "Painted Train" on the narrow gauge Durango and Silverton Railroad in Colorado. The painted train was an effort to promote the line for tourism which was successful enough to continue ...