I previously posted a 1971 calendar, but then found another copy and realized the one I scanned was missing some pages. UP calendars in the 1950s and 1960s had 16 pages, one for each month plus pages for December of the year before, the entire current year, the entire next year, and a page of photo captions or (beginning in 1961) Union Pacific agents. In most of the 1970s, however, the calendars were reduced to 12 pages and these extra pages were absent.

Click image to download a 28.1-MB PDF of this calendar.

So I didn’t think anything of it when I scanned a 12-page 1971 calendar. However, it turns out that 1971 was the last year UP calendars had those four extra pages. The cover page, excerpted above, is really the last page and is the same format (but with different photos) as the same page on the 1970 calendar, having replaced the agents page. The other three added pages have photos of Vail, Colorado (December 1970), Los Angeles Harbor (1971), and a UP freight in the Columbia River Gorge (1972).
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In the early 1960s, when Union Pacific was retiring its gas-turbine locomotives, it asked the major locomotive builders — GM, GE, and Alco — to develop Diesels that were roughly as powerful as the gas-turbines, i.e., at least 5,000 horsepower per unit. The “cover” picture of this calendar shows General Electric’s entry, the U50, which had four two-axle trucks, each supporting a 2,500-horsepower engine. Union Pacific ordered about 33 of these locomotives, and kept some in service for almost 15 years. That was a bit more successful than Alco’s entry, the 855, of which only three were built and which were scrapped after just eight years.

However, both were eclipsed by General Motors’ version, the DD-35 and DD-35A, some of whose 44 units remained in service until 1981. More importantly, by 1969 the DD-35 evolved into the DD-40, of which UP ordered 47 units that operated until 1985. The “cover” page of UP’s 1970 calendar had a photo of DD-40 6900, numbered to commemorate the railroad’s centennial year.