Photo of the Southern Pacific train Coast Daylight northbound at San Jose, California in 1954. The train replaced steam power for diesels in 1955. The engine in the photo, #4454, a GS-4, went to scrap.
Date
Card wasn't mailed so there's no postmark dating. The address for the producer doesn't have a Zip Code, which started in the mid-1960s. The train no longer ran for Southern Pacific after the 1971 Amtrak takeover of passenger train service. The card is circa 1950s to 1960s.
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.
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