down, as has the elevated structure to Harsimus Cove (with the exception of the Harsimus Stem Embankment), but PATH follows the alignment of the former underground. See also History of rail transport in the United States Notes Footnotes References External links History of the Camden & Amboy Camden & Amboy Railroad: Two Original “Joint Stock” Certificates Signed by Robert L. Stevens, Inventor of the "T"-Rail and Railroad Spike Corporate Genealogy - United New Jersey Railroad Railroad History Database PRR Chronology Predecessors of the Pennsylvania Railroad Defunct New Jersey railroads Defunct Pennsylvania railroads Railroads transferred to Conrail Railway companies established in 1872 Railway companies disestablished in 1976 American companies established in 1872 Pennsylvania Railroad Through-freight Lines