In a move that could eventually take tech workers off the controversial corporate shuttle buses and put them on fast electric commuter trains, big Peninsula employers â€" including tech giant Google â€" and business groups will announce a joint effort to speed modernization of Caltrain. Caltrain and coalition members plan to announce their push at an event Monday commemorating the 10-year anniversary of the popular Baby Bullet express train service, which added tracks that allow trains to bypass stations, make fewer stops and cut as much as 30 minutes from a trip between San Francisco and San Jose. Since the advent of the Baby Bullet, Caltrain’s average weekday ridership has jumped from about 24,000 to more than 61,000, and projections put the 2020 ridership at 70,000 or more.