So first you start out at the historic Transbay Terminal in San Francisco, which is better known for the legendary Key System, but it was reached by the Sacramento Northern (and also the SP's IER) for a brief time between the opening of the bridge railway in 1939 and the end of SN's passenger service in 1941. The route re-creates the Key System cab signalling while on the bridge railway (it was also used by SN and the IER when using the bridge railway). Traffic is VERY dense on the bridge railway, as it would have been.
Then there's a bit of street running through Oakland, first on the Key System's C line tracks on 40th street up to the cute, CUTE little 40th & Shafter yard, where the SN tracks branch off from the Key System. The C line tracks are modelled a bit further to the other side of the Broadway cut, to 41st and Piedmont Station. You get to drive up there on the introductory run. Quite a nice detail.
You then continue the street running up Shafter Ave. until reaching the ROW. From there on you can get your train up to speed, easily reaching 60 mph. You fly past the last suburbs of Oakland, up the hills, across a tunnel, and then down again toward Contra Costa county, through a few small towns, orchards, and then the marshy area leading up to Suisun Bay.
Again, sorry if it sounds like shilling, but the route is absolutely GORGEOUS, they've modelled quite a bit away from the train line, so it never looks bare or sparse. Period cars driving on the road (you can race them at times and feel like a boss) on the road and properly dressed people waiting at the stops make the whole thing feel very much alive.