Amtrak expansion: New Amtrak routes to Columbus, Ohio gain support
Amtrak unveils proposed new routes in response to Biden's $2 trillion jobs and infrastructure plan - The Boston Globe
Amtrak Route System Map - Association of American Railroads
Amtrak Northeast - an unofficial diagram of all Amtrak routes which either run along or have a station stop on the Northeast Corridor : r/TransitDiagrams