The Riverside County Transportation Commission (RCTC), in partnership with the Southern California Regional Rail Authority (Metrolink), Caltrans, and the City of Perris, is expanding the Perris-South Metrolink Station. This station serves as the end point for the 91/Perris Valley Line, north of Ethanac Road.

The project will add a second passenger loading platform at the station, along with canopies and other passenger amenities. To accommodate the new platform, 1,100 feet of new station track will be added to allow two passenger trains to board and deboard at the same time. This new track will also allow the station to remain operational if a train is out of service on one set of tracks.

The project also includes construction of a fourth track at the Perris-South layover maintenance facility. This will include building new track and installing a new switch for trains to change tracks. This will improve Metrolink service operations and efficiency by allowing more trains to be stored overnight.