In Atco it connected with the main line of the Camden and Atlantic Railroad.

The company planned to build west to Glassboro, New Jersey, but lacked the resources Philadelphia and Reading Railroad interests reorganized the company as the Williamstown and Delaware River Railroad and promptly extended the line to Glassboro.

[4] Passenger service between Glassboro and Mullica Hill ended in April 1929.

[5] In the 1930s the Reading Company and Pennsylvania Railroad agreed to merge their operations in South Jersey.

The Atlantic City Railroad was renamed the Pennsylvania-Reading Seashore Lines (PRSL), effective July 15, 1933, with two-thirds Pennsylvania and one-third Reading ownership.