The 4th annual Caltrain Holiday "Santa Train" will stop at the California Avenue train depot Sunday, Dec. 5, between 7:06 and 7:11 p.m. Riding on a super-sized toy train adorned with 40,000 lights and holiday decorations, Santa Claus and his elves, as well as Mrs. Claus, Frosty the Snowman and others, will get off the train to greet residents and pose for pictures.