This undated brochure gives the address of the Rio Grande’s office building as “Denver 2, Colorado.” That building is in zip code 80202. However, the 1962 timetable listed it as “Denver 17, Colorado,” suggesting that the Post Office changed the postal codes in 1963, the year it implemented the zip code system. The brochure wouldn’t have been from 1963 as we’ve already seen one from that year, and it couldn’t have been from much after 1963 or it would have used the full, five-digit zip code. So I date it to 1964.
The route from Durango to Silverton is 45.2 miles, and the train was scheduled to take 3 hours and 25 minutes. That’s an average speed of 13 miles per hour, which was probably typical for many trains of the vintage represented by the Silverton.