STOCKTON — The Altamont Corridor Express, relied upon regularly by commuters for its Monday-Friday service, has announced the receipt of grant funding that will allow its ACE trains to add Saturday service from Stockton to San Jose.

A start date has not yet been determined, but spokesman Chris Kay said the new service may begin in June. Kay said ACE still has to work out timing details with Union Pacific, which owns the tracks ACE runs on. ACE’s plan is to run two trains from Stockton to San Jose every Saturday morning, with two return trips each Saturday evening.

The new service is the result of grant funding awarded ACE by the California State Transportation Agency.

According to a news release from ACE, Saturday service has been a major request from passengers. The new service is being made available because of SB1, the state’s Road Repair and Accountability Act.

“Our efforts are focused on offering a service that meets the needs expressed by our passengers, so that more people choose to take trains,” said Stacey Mortensen, the executive director of the San Joaquin Regional Rail Commission. “Thanks to SB1, this has been made possible.”