UP's I-TAG3 is crossing the UP bridge across the Puyallup River just outside CP Reservation, where it will join the BNSF's Seattle Sub. At this point they are still putting their train together, so it's well be a little while before heading south on the "BN". Meanwhile, Cascades 505 is south on Main 1 and will cross over to Main 2 and then enter the Lakewood Sub at TR Junction.
With two sections of the Empire Builder, the Coast Starlight, Seattle, the Cascade Mountains, Columbia Valley and Puget Sound, Washington state offers rail buffs plenty of variety and beauty.