Caltrain will operate a holiday service schedule between the San Francisco and San Jose Diridon stations on Tuesday, Dec. 25 (Christmas Day), including two northbound and two southbound bullet trains. Caltrain will operate regular weekday service on Monday, Dec. 24 (Christmas Eve).
SamTrans buses will operate on a standard Sunday schedule on Tuesday, Christmas Day. Schedules for specific routes can be found here. Service on Christmas Eve will operate on the standard schedule.