Spotted this when doing a price and travel time lookup for next year. For whatever reason Amtrak has chosen to renumber the Surfliner Express as 599 instead of 563 with its new schedule starting on January 9th (available on pages 21 and 22). What's more intriguing, however, than the random number change is that it appears that Amtrak is converting it into a premium fare and reserved seat train. In Amtrak's system this starts on January 17th, 2012, which seems odd as that's a Tuesday. This could simply be a bug, of course, which the business class oddities would lend credence to, but Amtrak has yet to return an email asking about this.
Edit 12/14/11 8:33am: Amtrak has finally returned my email.
We apologize that it has taken longer than expected for us to reply. We have had an unusually high number of e-mail requests. Your patience is appreciated.Apparently, there is a programming glitch which the appropriate department is now working to resolve. All Pacific Surfliner trains offer unreserved coach and upgraded business class seats.