Ken, The end of track they arrive at is Sebastiani in Sonoma. [www.google.com]

If you scroll to left along the Sonoma Bike Path you'll see the Sonoma Depot on the old ROW. If you scroll to the right towards 8th St. you'll see a curving property line marked by trees which is the ROW. It curves southward and passes just to the east of Sonoma's Best Market and then straight down along 8th St. back to Schellville.

This was the NWP's Glenn Ellen Branch I believe. I believe it was cut back to Vineburg possibly around the time of the video and then the Cal Northern serviced a turkey farm there for a few years until that closed and it was cut back to a few hundred feet north of Schellville wye where part of the track is still in use for turning and storage.