Historically, Seattle has two major train stations: King Street Station and Union Station. The former historically served the Great Northern and Northern Pacific (and later Burlington Northern) whilst the latter served the Union Pacific and Milwaukee Road. After 1971, Union Station was closed as Amtrak consolidated to King Street Station (King Street has through-running tracks to up north whilst Union Station does not). The station building still stands but the tracks have been removed to make way for redevelopment. Link Light rail and Sound Transit Express have a station right next to it (International District/Chinatown). With all the talks of a Cascade high speed rail line, there's a possibility that a new station could be built using the historical Union Station as a base. This reactivated Union Station would initially be used for high speed rail and Sounder commuter trains (this will also give Sounder incentive to electrify). Currently King Street is space-constrained, and the Great Northern Tunnel leads to the winding historical route. This would require building a new station. Such a new station would be deep underground to avoid conflicting with Link light rail. Upon completion, all Sounder services will be redirected to this new ROW. Eventually, King Street will only be used for the Empire Builder and Rocky Mountaineer trains, although should Amtrak buy battery locomotives (Neo-Union Station is going to prohibit diesels) then the Empire Builder would be relocated to the reactivated Union Station as well.