Portions of a 1952 Pennsylvania Railroad brochure for its train, the Liberty Limited, which traveled between Washington DC and Chicago. This is the route map of the train.
Date
Dated at upper right of the route map for February 1952- 2-52.
Because I couldn't view the entire brochure, a copyright search for renewals was done at copyright.gov under "Pennsylvania Railroad". There were no listings for the railroad. The only listings that turned up were new registrations for the Pennsylvania Railroad Historical Society which is/was never an entity of the railroad, but an organization of those interested in the Pennsylvania Railroad and in preserving its history. There's no evidence copyright continues to be claimed on this material, if it was ever claimed at all.
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.
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