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Amtrak's "Acela Express" (reaching ), "Northeast Regional", "Keystone Service", "Silver Star", "Vermonter" and certain MARC Penn Line express trains (the three reaching ) are currently the only high-speed services on the American continent, and all are limited to the Northeast Corridor. The "Acela Express" links Boston, New York City, Philadelphia, Baltimore, and Washington, D.C., and while "Northeast Regional" trains travel the whole of the same route, but make more station stops. All other high-speed rail services travel over portions of the route. The California High-Speed Rail project, eventually linking the 5 largest cities in California, is planned to have its first operating segment, between Merced and Bakersfield, in 2027.