Because I couldn't see all of the brochure, renewal searches were done in books and periodicals for the years 1967 and 1968 There were no renewals related to the train or the railroad--only for city directories for Rock Island, Illinois. There's no evidence of a copyright renewal for this material.
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.