The Duquesne Incline, initially powered by steam, was constructed in 1877 by Samuel Diescher, a Hungarian-American civil engineer residing in Pittsburgh. This unique incline spans a length of 800 feet (244 m) and reaches a height of 400 feet (122 m), inclined at a steep angle of 30 degrees. What sets it apart is its track gauge of 5 ft (1,524 mm), which deviates from the norm in the United States but aligns with the standards of Finland, Russia, and Mongolia.

Samuel Diescher gained recognition for his role in designing numerous inclines across the United States, including various projects in Pittsburgh and Pennsylvania, in addition to his involvement in several other industrial and highway endeavors.

Originally, the primary purpose of the incline was to transport goods up and down Mt. Washington during the late 19th century. However, as time went on, it also began serving passengers, especially the residents of Mt. Washington who grew tired of ascending the steep footpaths to reach the top of the bluff. Due to industrial development driving working-class people away from the riverfront areas, inclines were constructed all over Mt. Washington to cater to their transportation needs.

As the twentieth century progressed, more roads were constructed on “Coal Hill” (as it was commonly known), and the rise in automobile usage led to the closure of most other inclines. Eventually, by the late 1960s, only the Monongahela Incline and the Duquesne Incline remained operational.

In 1962, the Duquesne Incline closed, seemingly for good. Extensive repairs were required, but with a dwindling number of customers, the private owners of the incline made minimal efforts. However, residents of Duquesne Heights initiated a successful fundraising campaign to aid in the restoration of the incline. Thanks to their efforts, the incline reopened on July 1, 1963, under the management of a nonprofit organization committed to its preservation.

Subsequently, the Duquesne Incline underwent a comprehensive refurbishment. The J. G. Brill and Company of Philadelphia, the manufacturer of the cars, meticulously stripped the paint to reveal the original wood. Additionally, an observation deck was added at the top, providing visitors with a panoramic view of Pittsburgh’s “Golden Triangle.” Today, the Duquesne Incline stands as one of the most popular tourist attractions in the city. In recognition of its historical significance, it was listed on the National Register of Historic Places in 1975. Furthermore, in 1977, both passenger inclines received the distinction of being designated Historic Mechanical Engineering Landmarks by the American Society of Mechanical Engineers (ASME).