Commuter Express.
Altamont Corridor Express (ACE) SC-44 Charger 3113 leads a matched set of cars through the marshlands in Fremont, operating as train 03 to San Jose.
Where once there was only one commuter carrier, Southern Pacific between San Jose and San Francisco, today there are three: Caltrain (former SP), Altamont Commuter Express, and the newest, SMART (Sonoma-Marin Rapid Transit).