Originally Posted by
roadman3313
I'd call and ask AGR first to change with the condition that you understand that if the CZ is running really late that you will change in SAC. I know people have made that connection in Davis and Emeryville. I have also purchased a ticket from RSV-EMY before as we'll (due to a last minute travel change) and I was allowed to stay in my room until Emeryville. As you said, that aspect is handled by the on board crew, however it is possible.
Either way you should be able to visit your friends in the Bay Area and have a nice journey.
I recently made an AGR reservation that includes a CZ/CS connection. I was informed that the train opreations folks are no longer allowing Davis or Martinez as a guaranteed connection, and that it must be made in SAC.
So your only choice is to buy a coach ticket on both legs to extend your trip past SAC and make the connection later versus changing the current reservation to allow a connection later down the line.