Amtrak has been offering college students in California a discounted ticket option for travel from now until June 13, 2013. Sadly, there are blackout dates, like Thanksgiving weekend, but there are many opportunities to save money.
Not all college IDs are valid for the discount, but in the Central Valley students at Fresno State, Fresno City, Bakersfield State, and UC Merced are among those included in the promotion.
Tickets must be purchased online at least three days in advance at this website, which also has the full list of details and restrictions. ID is presented on board if requested.
If you're making the trip anyway, why not save money. If you plan on driving for your trip, do the math and there's a good chance taking the train will save you money.