Since I wasn't sure I was able to see all of the pages of this, I checked for original copyrights in brochures for the year 1967, using "zephyr". There were no results. There's no indication that the material was ever under copyright.
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=Photo of the lower level of the Vista Dome observation car. |Source=[http://www.ebay.com/itm/CALIFORNIA-ZEPHYR-BURLINGTON-RIO-GRANDE-WESTERN-PACIFIC-ROUTE-GUIDE-MARCH-1967-/151323219275?pt=LH_DefaultDomain_0&hash=item233b9115...