Amtrak is the short form trade name for the US passenger rail service, (formally known as the National Railroad Passenger Corporation) formed in 1971 after freight railroads exited the intercity passenger business.
The Metroliner (4558) set is in Amtrak colors (although without logo). However, it is not actually a model of a Metroliner or indeed any specific US prototype, as it shares characteristics of both European and American trains.
- Amtrak article at Wikipedia.
- Amtrak Official site (includes schedules, fares, promotions, and reservations, primarily traveler oriented rather than modeler oriented)
- Trainweb Amtrak section of site with modeling/prototype info