Snavely was correct that the Camden and Amboy Railroad was a the first railroad in 1830.
My dates were mistyped and incorrect. The Williamstown railroad was chartered on March 13, 1871, by the owners of the Bodine glass works in Williamstown to build a line from Atco to Williamstown, and later to Glassboro.
On Oct. 21, 1872 Williamstown Railroad opened for regular service between Atco and Williamstown; connects at Atco with Camden & Atlantic and New Jersey Southern Railroads. The 9.5 mile line was completed to Glassboro in 1873. In 1887 a new extension was built to Mullica Hill. Now the line was 15.73 miles long. July 14, 1933 was the last run of passenger service between Williamstown Jct. and Glassboro, N.J.
The knuckle coupler or Janney coupler was invented by Eli H. Janney, who received a patent in 1873, but this Janney knuckle did not have the pointed back shown in the photos. If I could determine when this coupler was in use, I could tell if it fell within the years the railroad was in operation.
I have place a query with the National Railroad Museum. If anyone has other possible sources of informational lease let me know.