SP shoved inbound scrap into Judson's scrap receiving area shown at the upper right, using a lead that came off the Water Side Drill near the old Pfizer plant, and also accessed the south (railroad west) area of Judson's mill from a switch within the 34th Street interlocking plant that was controlled by the 16th Street tower operator.

SP yard jobs (originally from Emeryville Yard, later from the Desert or Glass House after E'ville was closed) were not permitted to operate on the actual plant trackage.

Judson used several small industrial locomotives for plant switching. They usually parked on the tracks near where you've circled.