International architecture practice, Grimshaw, in collaboration with Beyer Blinder Belle, Arup and VHB has revealed designs for the Washington Union Station Expansion project in Washington DC in USA. The project was presented, as part of review process with the district, to the US Commission of Fine Arts and the National Capital Planning Commission. Led by Union Station Redevelopment Corporation, together with Amtrak and the Federal Railroad Administration, the SEP will ensure the preservation of the historic stations, provide a new expanded and transformed multi-modal hub for the district adjacent to the historic station, and improved access to existing rail services, Metrorail, DC Streetcar and bus services. In addition, the SEP will incorporate enhanced vehicle access and cycle and pedestrian routes.The station is a key terminal on Amtrak’s Northeast Corridor, the busiest passenger rail corridor in the United States and is also the district’s primary intercity bus terminal, and the SEP will increase the transit capacity of the station which currently supports over 40 million passenger journeys a year.At the heart of the project is the new train concourse adjacent to the historic station which connects the existing Beaux-Arts station, designed by Daniel Burnham and opened in 1907, to new modernised tracks and platforms, a new bus facility, new passenger concourses, and below ground vehicle facility, which are all part of the expansion project programme. The train concourse, located to the north of the historic portions of the existing station, is defined by an expansive, clear-span roof structure with extensive skylights. This will become the circulation hub for the station, enhancing passenger experience, access, and mobility.Occupying the equivalent of two city blocks, the design for the station expansion also builds on the civic importance of the historic station, reinforcing and respecting its status as one of the nation’s treasured transportation landmarks but also, on an urban level, delivering a ‘new’ integrated destination for the district’s visitors and residents alike via the new H Street concourse linking the neighbourhoods to the east and west. The design has been coordinated with the independently proposed private mixed-use air-rights development over the rail yard.The project will now move into the next stage of concept development in tandem with the ongoing environmental review process.