Unlike yesterday’s stationery, this one lists the Chicago and North Western as the connecting railroad from Chicago to Omaha. It also has a nice little graphic of the sun setting behind the Golden Gate, entrance to San Francisco Bay.
Today, anyone picturing the Golden Gate would include the bridge of that name. This makes me suspect that this letterhead is from before 1937, when the bridge was completed, if not before 1933 when bridge construction began.
This colorful blotter is probably from about the same period as the above letterhead. It notes that, in addition to the extra-fare Overland Limited, Union Pacific offered three “no extra fare” trains on the Chicago-San Francisco route: the San Francisco Limited, Gold Coast Limited, and Pacific Limited. The blotter is clearly before 1936, the year the City of San Francisco entered service.