Read though this timeline done by me with info from PRR Chronology Research by Christopher T. Baer .
Enjoy! WJ&S Timeline 1836 - 1933
As you can see that , the Carney's Point line was Delaware River Railroad incorporated in N.J. as reorganization of (Delaware Shore Railroad who built the line); under control of DuPont interests, which have plans to build a large dynamite plant at Gibbstown.
Later West Jersey & Seashore Railroad Board confirms purchase of stocks and bonds of the Delaware River Railroad for $245,742. (MB)
Nov. 1, 1899 West Jersey & Seashore Railroad begins operating Delaware River Railroad running between Woodbury and Penns Grove, N.J., under agreement of Oct. 27, 1899.
On July 15, 1933, The Atlantic City Railroad leased the West Jersey & Seashore Railroad
and changed its name to Pennsylvania-Reading Seashore Lines .
The RDG had carfloats to the two DuPont plants in Southern New Jersey on the Delaware River, Carney's Point, and Gibbstown. From Pigeon Point DE and the Wilmington and Northern Branch. The W&N was RDG's route from Reading, PA to Wilmington, DE. Also owned by DuPont till leased to the RDG Co. IIRC the carfloats ran into the late 70's under Conrail.
The Salem Line is as Trainlawyer said "Incidentally the Salem Railroad ran Salem - Riddleton - Elmer and the connection down from Swedesboro came later."
Info from the timeline, SJ Rail/wiki/WJ&S, and SJ Rail.com (South Jersey Timeline of Historic Events)
July 1, 1863 Salem Railroad opens between Pittstown and Salem (Claysville), N.J., completing line.
Nov. 1867 Construction begins on Swedesboro Railroad in N.J
May 19, 1868 West Jersey Railroad leases Salem Railroad (Elmer-Salem) retroactive to Jan. 1, 1868. (Val)
Sep. 11, 1860 Last spike driven on Swedesboro Railroad between Woodbury and Swedesboro, N.J. (WdbryCnstn)
On January 21, 1882, the West Jersey Railroad, after being asked by agricultural interests of Woodstown, to build a railroad from the end of the Swedesboro Railroad to place called Riddleton Junction on the Salem Railroad. Completed in February, 1883, this gave the West Jersey Railroad two different routes into Salem.
Jan. 20, 1943 PRSL abandons 4.7 miles of Salem Branch between Daretown and Riddleton. (This is the 1st line to Salem)
December 30, 1950: Passenger service on the Salem Branch ends, gas powered motor car.
September 1988: Salem County purchases from Conrail, the Salem Branch between Swedesboro and Salem, operated by the West Jersey Railroad.
What year did the SRNJ takeover the Salem Line?