Zoomable Google Maps show the most interesting locations throughout the country where Amtrak trains switch between different lines, along with Amtrak routings serving various old Union Stations.

The downgrading of the line providing direct service, has resulted in Amtrak's Sunset Limited using a freight bypass route, stopping at a suburban location.

San Antonio
Station consolidation was achieved, and all railroads there eventually became part of Union Pacific.

Temple To Taylor TX
New Amtrak service involving multiple railroads would most directly use the Missouri Kansas Texas route between these two cities. But that route was not immediately suitable for passenger train speeds.