[lostdog]

Here's one of the entrances on streetview: https://www.google.com/maps/@37.7694654,-122.4291885,3a,75y,...

The SF MUNI system has light rail vehicles which do sometimes run on surface streets, similar to a trolley.

[alistairSH]

Oh, well I can totally see how a car would end up there if it was dark, stormy, or the driver was drunk/high. We gets cars on the local bike path all the time - usually a drunkard, but sometimes just somebody who thought it was a driveway.