 Metrolink trains and Amtrak's "Southwest Chief" also use the BNSF tracks through the crossing while Amtrak's "Sunset Limited" utilize the UP tracks for that service.The Union Pacific tracks come from the east through the Coachella Valley and into the yard in West Colton (onwards to Los Angeles).On the other hand, the BNSF tracks from the indirect west (Los Angeles) and direct south (Riverside and Corona) continue through the crossing and on to the yard in San Bernardino, which then head up north to Cajon Pass and eventually Barstow on the journey to Chicago.