It is sad to say but politically speaking it appears this administration has no use for transportation policy. Trump's victory in this regard was making some popular comments about "crumbling infrastructure", as well as getting to appoint a minority (Mrs. Chao) to his cabinet in an effort to silence critics and score points with the Heritage Foundation. Remember that Amtrak is strictly a northeastern railroad. In all places where Amtrak operates outside the NEC, it must conduct operations at the discretion of apathetic freight carriers who maintain their infrastructure to the least passable standards.
Nationalized tracks (state-owned, mostly; some leased by states under very-long-term leases; some owned by Amtrak or commuter rail authorities) which Amtrak operates on:
NORTHEAST:
-- Boston - Maine border
-- Worcester - Boston
-- NEC, Boston - Washington
-- New Haven - Hartford - Springfield - roughly Vermont border
-- New York - Hoffmans (west of Schenectady)
-- Albany - junction with CSX towards Boston ("Post Road Branch")
-- Montreal final station approach tracks
-- east of Niagara Falls NY station - the vicinity of Niagara Falls ON station
-- Aldershot ON - Toronto
-- Philadelphia - Harrisburg
MIDWEST:
-- east of Dearborn MI to west of Michigan City IN
-- Grand Rapids station tracks
-- Chicago River (south branch) through Chicago Union Station, north to Glenview IL
SOUTHEAST:
-- New Orleans Union Station approaches
-- Charlotte NC (north of station) - Greensboro NC - Raleigh NC
-- Miami FL - Mangonia Park, FL
-- north of Poinciana, FL - DeLand, FL
TRANSCON:
-- St. Paul station tracks
-- Denver Union Station approaches
-- Isleta (south of Albuquerque) - north of Lamy
-- Dallas - Fort Worth
WEST COAST:
-- (soon) Nisqually - east of Tacoma, WA
-- LA Union Station approaches
-- Los Angeles - Moorpark (IIRC, might be further)
-- Fullerton (just south of Los Angeles) - San Diego
Probably more than you thought, eh? All proposals for a new Long Bridge would separate passenger tracks from freight from DC to Alexandria, meaning more nationalized track. South of the Lake is an attempt to have passenger-only nationalized track from Michigan City to Chicago. Vermont is planning to extend service to Burlington on nationalized track...