1937 booklet about the Santa Fe trains The Chief and the Super Chief.  The railroad was showcasing the streamlined changes made to its main Chicago to California trains.  <a href="https://en.wikipedia.org/wiki/Super_Chief" class="extiw" title="en:Super Chief">en:Super Chief</a> had given up its boxcab locomotives for EMC E1 units. <a href="https://en.wikipedia.org/wiki/Chief_(train)" class="extiw" title="en:Chief (train)">en:Chief (train)</a> was no longer pulled by the "Blue Goose" steam locomotive, but also by E1 diesel locomotives.
Atcheson, Topeka and Santa Fe Railway
Seller says the booklet dates from 1937 and this looks to be a correct date.
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