This insignificant secondary extends to some industries near the the Park Street bridge to Alameda. The tracks are no longer used to get to them though. This track eventually joins back up to the UP main a mile or so further south near Fruitvale Ave. The industries are reached using the Fruitvale connection. There is some interesting street trackage as well as the typical tight squeezes and interesting track arrangements to get there. I should get some pictures while I still can.
UP occasionally stores cars on this secondary, such as ballast cars, but not for very long. There is an effort to redevelop the area along the water so the UP appears to be playing along and limiting use including using it to access the industrial area. The rails are in place but have signs between the rails.