The sixth Amtrak Cascades Airo trainset has departed for testing, moving the Pacific Northwest fleet renewal beyond its halfway point and closer to passenger service.

Amtrak Cascades Airo cab car travelling through forest near Alta, California
The first Airo delivery move heads through Alta, California, toward testing in Pueblo on 22 July 2025. Photo: George Luchs / Wikimedia Commons / CC0.

Sixth unit advances the testing programme

Amtrak said in its 13 July fleet update⁠ that the latest trainset had left the production facility and was heading east for acceptance testing before delivery to the Pacific Northwest. It is the sixth of eight new trainsets planned for Amtrak Cascades and another milestone in the wider national Airo programme, which covers 83 trainsets.

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Each unit must complete several stages before carrying passengers. The three-stage testing programme⁠ includes validation on a dedicated railway at the Transportation Technology Center in Pueblo, Colorado, followed by trials on the Northeast Corridor. Final route proving, simulated service, crew familiarisation and mechanical training will then take place in the Pacific Northwest.

More capacity and passenger-focused interiors

The Cascades order includes eight trainsets, two additional locomotives and one spare cab car. According to the Amtrak Cascades fleet page⁠, the first two new trains are expected to enter passenger service in autumn 2026 after testing, regulatory approvals and staff training are complete.

Each trainset will offer more than 300 seats across coach and business class. Passenger features include panoramic windows, a redesigned café car, power outlets, USB ports, Wi-Fi, digital information displays and six large touchless restrooms. The trains are being built by Siemens Mobility in California with US-sourced components.

The fleet can reach 125 mph, although Amtrak Cascades services are currently limited to 79 mph on the shared regional corridor. The initial benefit will therefore come from renewed rolling stock, additional capacity and improved passenger amenities rather than higher operating speeds.

Amtrak Cascades Airo trainset arriving near King Street Station in Seattle
The first Siemens Airo trainset in Amtrak Cascades livery reaches Seattle on 16 May 2026. Photo: SounderBruce / Wikimedia Commons / CC BY-SA 4.0.

Vancouver preclearance supports the fleet transition

A separate operational change is also improving the international section of the corridor. Amtrak opened North America’s first passenger rail preclearance facility⁠ at Vancouver’s Pacific Central Station on 10 June 2026.

Southbound passengers now complete US customs and immigration checks before boarding. This removes the previous en route border inspection and gives travellers a single processing step at the station.

The fleet renewal and the new border process address different constraints, but together they strengthen the Eugene–Seattle–Vancouver service ahead of the Airo launch. The autumn 2026 timetable remains dependent on successful testing, approvals and operational readiness.

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