AECOM (legacy Shimmick) performed the Downtown San Bernardino Passenger Rail project, a one-mile extension of Metrolink infrastructure for extended commuter rail service from the San Bernardino Santa Fe Depot to the San Bernardino Transit Center.

The work included re-alignment and addition of a second track; additions and modifications of railroad communication and signal systems for centralized traffic control (CTC) and positive train control (PTC); new rail passenger platforms at the depot and new platforms at the transit center station; grade crossing closures and modifications; street and utility improvements; additions and modifications to parking lots landscape and irrigation, grading and security systems; and construction of a pedestrian over-pass at the depot and a Metrolink crew building at the transit center station.

The project was completed in 2017.