Thruway is the name for the network of feeder bus routes that Amtrak operates throughout the U.S. These buses allow it to reach cities and towns that are not located on its national rail network, and also to complement train services on other routes. They use Amtrak stations and are coordinated with Amtrak arrivals and departures, offering guaranteed connections and through ticketing.

These services are mostly operated by Amtrak in partnerships with state departments of transportation, and are contracted to existing motor bus operators. Other bus companies, such as Greyhound, offer connecting services to Amtrak trains, but operate separate facilities, ticketing and equipment.

In Oregon, Amtrak, in conjunction with ODOT and contracting operators, operates Thruway services between Portland and Eugene, Portland and Astoria, Ontario and Coos Bay via Bend and Eugene, Albany and Newport, Redmond and Chemult via Bend, and a seasonal connection from Klamath Falls to Crater Lake National Park.

In Washington, Amtrak, in conjunction with WSDOT and contracting operators, operates Thruway coaches between Seattle and Vancouver, B.C., Kettle Falls and Spokane, Seattle and Port Angeles, Pasco and Walla Walla, and Seattle and Spokane. The Seattle-Spokane service continues to Boise, Idaho via Pullman, Wash. and Lewiston, Idaho.