The California High-Speed Rail Authority and the Los Angeles County Metropolitan Transportation Authority (Metro) have reached a funding agreement that will bring $400 million in public funds to the Link Union Station project. 

Link US, as the project is widely known, aims to retrofit Los Angeles's Union Station to facilitate the creation of "through-service" regional commuter rail—and in the future, High Speed Rail—routes connecting the station with locations north, south, and east of Los Angeles. 

Currently, the station's track configuration leaves Union Station as the dead-end of several regional rail systems; When the improvements are completed in coming years, the station will be able to facilitate regional rail travel up and down the California coast while also cutting down on the amount of time trains spend idling at the station. Los Angeles Union Station currently connects roughly 100,000 daily travelers with a half-dozen transit options. The number of commuters is expected increase to 200,000 daily travelers by 2040 as additional regional rail and High-Speed Rail traffic come online. 

Gruen Associates and Grimshaw Architects have been working on a new master plan for the 80-year-old train station. A final Environmental Impact Report for the project was approved by the Metro earlier this year that calls for widening an existing 30-foot underground corridor by 110-feet to accommodate the increased passenger traffic.