In the south, the Burlington and Mount Holly extended its line another 6.5 miles (10.5 km) east to Pemberton, New Jersey, on January 1, 1863.

[5] The Pennsylvania Railroad selected the Burlington Branch for an early experiment in railway electrification.

It constructed a power plant in Mount Holly and electrified the branch with 500 V direct current, using overhead wires.

[7] The electrified service was a technical success, but did not dramatically improve the financial performance of the branch line.

[8] The power plant was destroyed in a fire on October 29, 1901, and the Pennsylvania Railroad decided to abandon the electrification.