Amtrak fan--I just discovered this question of yours (from September and October) today. I don't know if you are still interested, or if you have found some info otherwise.
However, I should be able to help you with this next week, around Feb. 15 or so ----- my computer is at home, I am at work, and I will be on vacation after today and until next Tuesday.
Meanwhile, from memory, (at the office), I recall it being something like this: maybe about 3 coaches and 3 pullmans CHI to - Seattle, maybe about two each to Portland. A diner, a great dome, Some of the coaches will have domes.
Keep in mind in later years it and its archrival, Northern Pacific"s "North Coast Limited"(similar equipment) ran combined from CHI to the Twin Cities, on CB&Q or later BN tracks. As I recall, I sort of think the Portland sections of these two trains ran combined between Spokane and Portland, also.
In the early days of Amtrak, there was a train called the "North Coast Hiawatha". That name was meant to evoke the memory of both the North Coast Liimited and the Olympian Hiwatha, a Milwaukee train to Seattle and Tacoma.