Passenger train service between Seattle and Portland-the core of what became the Cascades corridor-was operated as a joint partnership by the Northern Pacific, Great Northern, and Union Pacific from 1925 to 1970, with the three railroads cross-honoring tickets on their Seattle-Portland routes. When Great Northern and Northern Pacific were folded into the Burlington Northern in 1970, the reconfigured partnership continued to operate the Seattle-Portland service until the creation of Amtrak in 1971. Service between Vancouver, BC and Seattle was provided via the Great Northern/Burlington Northern International, and between Portland and Eugene by Southern Pacific.