>>1176858. I'veThe Pittsburg/Bay Point BART line is a kind of successor to the SN, which also ran some commuter services from Pittsburg to San Francisco. Part of the BART line runs on the same former SN alignment. I've drawn in more or less where the SN ran onto this current map showing the BART line. Again in orange where it ran on Key system tracks, and green the SN tracks.
That's all I've got for now, I hope you guise found this kinda interesting.