This joint operation ended on June 11, 1973, when Amtrak extended the "North Coast Hiawatha" to Seattle over the Great Northern's route, which included Stevens Pass and Cascade Tunnel. This new routing served the northern Washington communities of Wenatchee and Everett, which had previously been without service. The train remained on a tri-weekly schedule west of Minneapolis. For the summer of 1974 Amtrak added a second train, the "Expo '74" (named for the "Expo '74" then being held in Spokane), to the Seattle–Spokane segment.