[1][2][3] Thought to have been the brainchild of DL&W president William Truesdale, the Pequest Fill was one of several remarkable features of the Cut-Off, a 28.6-mile (46-km) project that aimed to reduce the length, grades, and curvature of the railroad's main line over the hilly terrain between Port Morris, New Jersey, and the Delaware Water Gap.
[4][2] Planning for the route continued through 1906; the final survey map for the line was completed on September 1, allowing the railroad to proceed with eminent domain and hire contractors.
Whether by design or happenstance, the responsibility for building the Pequest Fill was divided roughly in half between David W. Flickwir to the east and Walter H. Gahagan to the west.
[5] The Fill was touted as the highest railroad embankment in the world, having an average height of 105 feet as measured from the level of the Pequest River at its crossing.
[3][10][11] Its volume was also a new record, far surpassing the 4 million-plus cubic feet used by the Union Pacific railroad in its 1908 Lane's Cut-off west of Omaha, Nebraska.
In 2011, NJ Transit received approval to re-lay track between Port Morris Junction and Andover; as of 2023, the line is slated to open for rail service in 2026 or 2027.