BCL
Engineer
This includes rail, so I'm not sure if it neatly fits into non-rail or commuter rail. This is ongoing and they're updating it as it goes. Right now they seem to be on SMART to Santa Rosa, which I guess would be needed to get them to link up to Santa Rosa's bus system.
https://www.sfchronicle.com/bayarea/article/total-transit-2022-17470266.php
https://www.sfchronicle.com/bayarea/article/total-transit-2022-17470266.php