Starting in 1957, GN replaced the orange-and-green timetable covers it used in the early 1950s with this blue-and-red cover featuring Great Domes on the Incomparable Empire Builder. Inside, there are some font changes and slight changes in schedules, but the contents are, page-by-page, very similar to those of a year or two before.
In fact, comparing this 1957 timetable with one from 1955, the first 19 pages have almost no differences other than the cover and the color of ink. On page 20, two branch line trains, from Great Falls to Augusta and Great Falls to Pendroy, have disappeared. Page 22 reveals that a train from Fergus Falls to Pelican Rapids, MN, has also been cancelled. Other minor changes follow but in the end, this timetable still has 48 tables of trains compared with 51 in 1955. After that, the only major difference is that a four-color back cover ad for the Western Star has replaced an ad for the Empire Builder that is just green and orange.