Plus surfboards are a pain to fly with, and it's probably gonna get damaged in the process. At least with a train you could have it with you for more of the journey, and the luggage stowing is probably less intense.
I just wish there was a train from somewhere near me to the beach. Local trains everywhere would be sick. I envy the people in new york, who between some walking/skating/biking and some trains the can get to the beach and go surf.