Union Station, New Haven, CT to Princeton Junction Station at West Windsor, West Windsor Township, NJ train with Amtrak

Amtrak is the main passenger train operator in the United States, providing medium- and long-distance intercity services across 46 states and three Canadian provinces. Operating over 300 trains daily and serving more than 500 destinations, Amtrak connects cities and regions nationwide through routes such as the high-speed Acela in the Northeast Corridor, the scenic Coast Starlight along the West Coast, and the Empire Builder linking Chicago to the Midwest and the Pacific Northwest. Other notable services include the Northeast Regional, Keystone Service, and the unique Auto Train, which allows passengers to bring their cars onboard. Amtrak offers a variety of classes to suit different budgets and travel needs, including Coach, Business, First Class, and Sleeper Class with options like Roomettes, Bedrooms, and Bedroom Suites for overnight journeys. Ticket types include Saver, Value, Flexible, Business, and Premium. Onboard amenities vary by service but may include comfortable seating, Wi-Fi, power outlets, dining options, and lounge access on select trains. Popular routes include Washington, D.C.–Boston, San Diego–San Luis Obispo, San Jose–Sacramento, and Chicago–Seattle.

Amtrak Acela is the flagship high-speed train service operated by Amtrak, the national rail operator of the United States. Running along the Northeast Corridor, Acela connects major cities such as Washington, D.C., Baltimore, Philadelphia, New York City, Providence, and Boston. It is the fastest train service in the U.S., reaching speeds of up to 150 mph (250 km/h). Passengers can choose between Business Class and First Class. Both offer seat reservations, free Wi-Fi, power outlets, adjustable lighting, conference tables, and large tray tables, with spacious seating and extra legroom. Business Class includes complimentary snacks and beverages, while First Class offers larger seats, complimentary meals, and access to premium lounges. Food and drinks are also available for purchase at Café Acela. Popular routes include Washington, D.C.–New York City, New York City–Boston, and Philadelphia–Washington, D.C.