See photos of Amtrak's new Acela trains, which will operate along the Northeast corridor as part of a $2.4 billion investment.

WASHINGTON — Amtrak has unveiled the new look of its next-generation Acela trains that will operate along the Northeast corridor as part of its $2.4 billion investment in faster Acela service that also includes extensive renovations at Union Station.

The next generation of trains will be able to travel 160 mph, as opposed to the current 130 mph. (Courtesy Alstom) Courtesy Alstom The new trains will be among the most energy efficient in the world, the company said. (Courtesy Alstom) Courtesy Alstom The new trains will begin service in 2021. See what that will look like in Amtrak’s video. (Courtesy Alstom) Seat space will increase by one-third on the new trains, which will be ready in 2019. (Courtesy Alstom) Courtesy Alstom ( 1 /4) Share This Gallery: Share on Facebook. Share on Twitter. Share via email. Print.

Amtrak has contracted with French high-speed train maker Alstom to produce 28 next-gen Acela train sets capable of traveling 160 mph, compared to the current Acela top speed of 135 miles per hour.

The new Acela trains will be among the most energy efficient in the world and will have one-third more passenger seats.

Amtrak will eventually increase Acela service between D.C. and New York to twice an hour.

The prototype of the new trains will be ready in 2019, with the first entering revenue service in 2021. All 28 new Acela train sets are expected to be in service by the end of 2022.

The upgrades also include a concourse modernization project at Union Station’s intercity and commuter rail concourse that includes an additional 20,000 square feet of new passenger space, nearly doubling the concourse’s capacity.

The concourse project is a partnership between the Union Station Redevelopment Corporation, the Federal Railroad Administration and other station partners, though funding for the project comes predominantly from Amtrak.

The concourse modernization project is separate from the long-term Union Station expansion that is currently ongoing, with a long-term goal of tripling passenger capacity and doubling train capacity over the next 20 years.