As far as equipment goes.....when the Pioneer first began, it consisted of a baggage car, a couple of Amfleet I's, an Amdinette, and a Heritage 10-6 sleeper. It originated in SLC, received connection from the RGZ, then the same at Ogden from the SFZ, and continued up to Seattle.
In the matter of detours, "that far north", the SFZ on occasion would detour even further north--by way of McCammon, Idaho, when the line thru Echo Canyon was blocked....
I was aboard the SFZ during one of those detours eastbound, and after regaining the mainline at Granger, Wyoming, "Uncle Pete" put on a dazzling display of its might, rolling us along at 100 per, until turning down towards Denver at Speer. We arrived in Denver just slightly delayed, thanks also to some padding.
Union Pacific still had some pride in those years.....