Amtrak has begun placing its new Airo passenger trainsets into revenue service this week, marking the first introduction of purpose-built new rolling stock to replace the operator's 1970s-era Amfleet I coaches on Northeast Regional and state-supported routes.

The Siemens Mobility-built trainsets, assembled at the manufacturer's facility in Sacramento, California, will over the coming months displace Amfleet I cars that have handled most of Amtrak's short- and medium-distance services east of Chicago for more than four decades.

What is actually different about Airo?

The trainsets use a fixed push-pull configuration: a power car at each end with passenger coaches between them. The arrangement removes locomotive run-around moves at terminal stations and is intended to shorten dwell times compared with the Amfleet I operation.

Passenger-facing upgrades over the Amfleet I cars include:

• Seatback power outlets and USB-C charging
• Larger overhead luggage racks for roll-aboard bags
• Dedicated bicycle storage on most coaches
• Redesigned café and food-service galleys
• Updated HVAC and onboard Wi-Fi
• Refreshed accessibility spaces compliant with current ADA standards

The interiors replace the original 1970s fabric, fittings and lighting layouts that Amfleet I riders have endured for years. Seating is two-by-two throughout standard class, consistent with the previous layout.

Which services receive Airo first?

Initial deployment covers Northeast Regional trains running between Boston South, New York Penn and Washington Union Station via the Northeast Corridor, together with state-supported mid-Atlantic routes operated in partnership with the Virginia Passenger Rail Authority.

Additional corridors — including longer Northeast Regional round-trips and services through the Carolinas — will receive Airo sets as acceptance and crew-training milestones are met. The Amfleet I coaches the sets replace will be progressively retired as new trainsets enter service; some cars may stay in revenue use on lesser-used corridors during the transition.

Why has the rollout taken this long?

The Airo programme traces back to Amtrak's late-2010s fleet-planning cycle, which identified the Amfleet I fleet — many cars built between 1975 and the late 1980s — as the operator's most urgent replacement priority after its Acela high-speed sets.

Production at the Sacramento plant, regulatory certification with the Federal Railroad Administration, and supply-chain disruptions all contributed to slippage against earlier delivery targets. Each trainset has to pass a structured acceptance programme covering dynamic testing, brake qualification and emergency-systems verification before revenue service.

What happens to the displaced Amfleet I cars?

The retired coaches will be removed from revenue service in stages. Disposition may depend on mechanical condition, regulatory limits and storage capacity; some cars will be scrapped or sold, others held in reserve.

The cascade will free Amtrak's maintenance facilities at Ivy City in Washington and Southampton Street in Boston for the next phases of capital work, including the upcoming Acela Avelia Liberty high-speed trainset commissioning and other fleet programmes already in the pipeline.

What comes next?

Amtrak expects the Airo fleet to expand through the coming years as the remaining trainsets complete commissioning. Once fully deployed, Airo will become the standard short- and medium-haul intercity trainset across most of the operator's network east of the Mississippi, with Acela premium service running separately on the Northeast Corridor.

The deployment marks the most significant change to Amtrak's short-haul fleet since the original Amfleet I deliveries of the mid-1970s.