There are or were offices at Sunnyvale Caltrain station. They also have shuttles that regularly service Mountain View, Sunnyvale, and Diridon stations; the ride

There are or were offices at Sunnyvale Caltrain station. They also have shuttles that regularly service Mountain View, Sunnyvale, and Diridon stations; the ride should only be 10-15 minutes. However, I do not think Caltrain has the capacity for tens of thousands of new commuters.