Side view of a streamlined Rio Grande Trailways 180 bus, ACF Model 37P, Serial No. 047, City Park, Denver, Colorado. Lettering on bus reads: "Rio Grande Trailways, 180, Los Angeles - Salt Lake - Grand Junction - Pueblo - Denver - Omaha - Kansas...
Rio Grande Trailways--1930-1940.; Denver (Colo.)--1930-1940.; Buses--Colorado--Denver--1930-1940.
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