Amtrak’s NextGen Acela fleet represents a significant upgrade to high-speed rail services in the United States. Designed to replace the original Acela Express trains, the new fleet promises increased capacity, improved energy efficiency, and enhanced passenger comfort.

The original Acela Express trains were introduced in 2000 to provide high-speed services along Amtrak’s Northeast Corridor (NEC), which connects major cities such as Washington, D.C., Philadelphia, New York, and Boston. These trains, while faster than conventional services, have long been criticised for their limited capacity and lack of modern amenities.

In response, Amtrak announced in 2016 that it had awarded a 2 billion USD contract to Alstom to design and build 28 next-generation high-speed trainsets. These new trains, branded as the “Avelia Liberty” model, form the backbone of what is now referred to as the NextGen Acela fleet.

Amtrak’s NextGen Acela testing on the Northeast Corridor

© Amtrak

Design and Technology

The NextGen Acela trains are based on Alstom’s Avelia Liberty platform, a derivative of the company’s widely used TGV technology in France. The new trainsets feature articulated carriages, improved aerodynamics, and an active tilt system designed to allow higher speeds through curves without compromising passenger comfort.

Each trainset will be capable of reaching speeds of up to 160 mph (257 km/h), an increase from the current Acela Express top speed of 150 mph (241 km/h). However, actual speeds are limited by track and signalling infrastructure, much of which is still being upgraded.

Notable features include:

• Increased capacity: Each new trainset will offer nearly 25% more seats than the current Acela trains, with 386 seats across Business and First Class.
• Modern interiors: Passengers can expect updated amenities such as improved Wi-Fi, personal power outlets, USB ports, and more spacious seating.
• Accessibility: The trains comply with the Americans with Disabilities Act (ADA) and feature improved accessibility, including wider aisles, accessible toilets, and boarding assistance technology.
• Environmental performance: The Avelia Liberty trains are lighter and more energy-efficient than their predecessors, with regenerative braking systems and improved aerodynamics.

Manufacturing and Testing

The NextGen Acela fleet is being manufactured at Alstom’s Hornell facility in upstate New York. While the trains are designed with European expertise, their production in the US supports hundreds of American jobs and includes components sourced from across the country.

Testing of the trainsets began in 2020 at the Transportation Technology Center in Pueblo, Colorado. Further testing has taken place on the Northeast Corridor itself, especially between Washington, D.C., and Boston, to ensure compatibility with existing infrastructure and to obtain necessary safety certifications.

Amtrak’s NextGen Acela train

Delays and Entry Into Service

Originally, the new trains were expected to enter service in 2021. However, a combination of COVID-19-related disruptions, supply chain issues, and challenges in integrating new technologies with the NEC’s legacy infrastructure led to delays.

This week, Amtrak announced that the first 5 trainsests would commence service on 28 August. The full fleet is set to follow in 2027.

Once fully deployed, the NextGen Acela fleet is expected to significantly enhance Amtrak’s competitiveness on the NEC, particularly for business travellers who rely on speed, comfort, and reliability.

However, the success of the new fleet also hinges on continued investment in infrastructure improvements—track upgrades, modernised signalling, and station enhancements.

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