The "Automated Rail Way" map scheme went from 1962 to 1972, replaced when the marketing slogan became "We Can Handle It". This motif originally started with the short-lived "Stoddard Logo" (a/k/a "Campbell's Soup"), with the familiar "shield" medallion returning in 1963. In 9/69 the medallion changed from "Union Pacific Railroad" to just "Union Pacific", so there are technically three versions of the map scheme, '62-'63, '63-'69 and '69-'72.
http://www.uprr.com/aboutup/history/uplogo/logo08.shtmlBasically, you're safe for your era, Kiz, but I wouldn't weather anything with the newer medallion since it would have been a brand-new car in '71.