The Seattle section uses the Cascade Tunnel and Stevens Pass as it traverses the Cascade Range to reach Spokane, while the Portland section runs along the Washington side of the Columbia River Gorge. The cars from the two sections are combined at Spokane. The combined train then traverses the mountains of northeastern Washington, northern Idaho and northwestern Montana, arriving in Whitefish in the morning. The schedule is timed so that the train passes through the Rocky Mountains (and Glacier National Park) during daylight - an occurrence that is more likely on the eastbound train during summer. Passengers can see sweeping views as the Builder travels along the middle fork of the Flathead River, crossing the Continental Divide at Marias Pass. After crossing Marias Pass, the Empire Builder leaves Glacier National Park and enters the Northern Plains of eastern Montana and North Dakota.