This is a summary of the track used by Amtrak. By my count this consists of 21,745 route miles. The current system is the smallest in the 34 years Amtrak has been operating.
I am listing each route by current ownership, traditional ownership and mileage by state. I am deleting duplicate routes such as Autotrain or the Vermonter between Washington and New York City.
Western Long Distance Trains
Coast Starlight
Seattle to Los Angeles 1,389 miles
Seattle-186 miles BNSF-Portland-1,202 Union Pacific-Mission Tower-1 Metrolink- Los Angeles
Seattle-176 Northern Pacific-Vancouver-10 Spokane, Portland and Seattle-Portland-1,202 Southern Pacific-Mission Tower-1 Los Angeles Union Passenger Terminal-Los Angeles
Washington 177, Oregon 348, California 864
Empire Builder
Seattle to Chicago 2,206 miles
Seattle-1,788 BNSF-St. Anthony-2 Minnesota Commercial-Merriam Park-384 Canadian Pacific-Rondout-32 Metra-Chicago
Seattle-316 Great Northern-Lyons-8 Burlington Northern-Sunset Jct.-68 Northern Pacific-Sandpoint-2 Burlington Northern-Boyer-89 Great Northern-Ripley-64 Burlington Northern-Stryker-995 Great Northern-Fargo-178 Northern Pacific-St Cloud-68 Great Northern-St. Anthony-2 Minnesota Transfer-Merriam Park-416 Chicago, Milwaukee, St. Paul and Pacific-Chicago
Washington 349, Idaho 102, Montana 668, North Dakota 424, Minnesota 380, Wisconsin 235, Illinois 48
Portland Empire Builder
Portland to Spokane 378 miles
Portland-378 BNSF-Spokane
Portland-230 Spokane, Portland and Seattle-SP&S Jct.-148 Northern Pacific-Spokane
Oregon 9, Washington 369
Westbound trains use 10 miles of ex SP&S west of Spokane.
California Zephyr
Oakland to Chicago 2,425 miles
Oakland-1,388 Union Pacific-Denver-1,036 BNSF-Roosevelt Road-1 Amtrak-Chicago
Oakland-557 Southern Pacific-Elko-242 Western Pacific-Smelter-18 Western Pacific or Union Pacific-Salt Lake City-571 Denver and Rio Grande Western-Denver-1,036 Chicago, Burlington and Quincy-Roosev