[2] A supplement to its charter passed on January 25, 1866 allowed it to extend from Williamstown west to the Delaware River at Penns Grove, New Jersey, or some point within a mile of it.

[4] In 1871, Samuel Garwood and John F. Bodine, owners of a glass works in Williamstown, began to push forward construction of the railroad to provide an outlet for their business.

[5] The company constructed a 9.5-mile (15.3 km) line from Williamstown to Atco, New Jersey, where it connected with the Camden and Atlantic.

[5] During Bodine's tenure as president and superintendent of the company, freight rates were adjusted for the benefit of the glassworks, with the railroad run as close as possible to breaking even.

Once the Philadelphia and Atlantic City was converted to standard gauge in 1884 the importance of the Williamstown branch diminished.