There is a good map at
Old Chester, PA for the western parts of these lines. Look down to "Chester, PA, Industrial Map, 1941". Unfortunately the color or shape used to distinguish PRR and RDG hasn't survived the scanning process very well.
Tackling the line to the east, the PRR line passing through Wanamaker Yard *was* the "Hog Island" line. To clarify, the Reading line has been abandoned west of where the RDG and PRR converge, through the yard, across Darby Creek, etc.; the old RDG truss bridge over Ridley Creek is still clearly visible from the NEC. East of the convergence, the former RDG line (officially Chester Branch?) is intact and seems to form the "main stem" into this area. PRR runs east around the airport, onto Hog Island, past Ft. Mifflin, swings north and ducks under the Penrose Ave. Bridge, crosses Mingo Creek, and the main line forms a tail track for a spur into an oil refinery. It is abandoned north of here and the ROW used to store a really phenomenal number of junked autos. It curves westward to reach the abandoned crossing of the RDG line; this is where the R1 Airport Line swings off the PRR alignment and onto the RDG. Remainder of the PRR line is intact as the Airport Line, although former wye at BRILL has been heavily reconfigured, replaced with flying junction and PHIL interlocking.
Returning to the Eddystone Loop, it's much more visible in aerial photgraphs than from the NEC, where the remains are concealed by a contractor's parking lot. Not only did RDG (now abd.), running strictly parallel with Industrial Hwy., duck under the loop and cross Ridley Creek, the PRR (still operational) diverged from the side of the loop and crossed Ridley Creek parallel with the RDG. The two lines converged at about Avenue of the States, the PRR terminating with a switch into the RDG, which crossed Chester Creek with a single track. The PRR diverged again some distance to the west; again, RDG is now abandoned, PRR operational. RDG originally reached as far west as Thurlow. Official PRR designations were: 60th St. Branch, first 4.5 mi. of Hog Island line from connection at BRILL. (to vicinity of Fort Mifflin). West of that point to connection with RDG, Chester & Philadelphia Branch, connected to mainline at Eddystone by Eddystone Loop. From RDG connection west of Chester Creek to Marcus Hook, South Chester Branch, connected to main line at Lamokin by Lamokin Run Branch and at Trainer by Linwood Branch. (Claymont Branch extended W end of Linwood Branch to some more refineries; Sunoco plant railroad, Delaware River & Union RR, also connected in this area.)
Between those industrial maps and a PRR CT 1000, you can get a very good idea of what was what in this area.