Duquesne Incline, Funicular railway on Mount Washington, Pittsburgh, United States

The Duquesne Incline is a cable railway on Mount Washington in Pittsburgh that climbs approximately 800 feet (244 meters) along a track rising 400 feet (122 meters) at a 30-degree slope. It connects Carson Street at the base with the summit of Mount Washington and operates two counterbalanced cars that each carry up to 23 passengers.

The railway opened in 1877 to carry cargo and residents up the steep slope of Mount Washington during Pittsburgh's heavy industry era. It originally ran on steam power and was later converted to electric motors, while many other hillside railways in the city closed during the 20th century.

The cars were built by J. G. Brill and Company of Philadelphia, and their paint was later stripped away to reveal the original wood. At the upper station, a museum-like collection of original fittings, photographs, drawings and timetables recalls the era when Pittsburgh was the steel capital of the United States. Staff dressed in period clothing still punch tickets by hand.

The two cars run in counterbalance on a 793-foot track, so departures alternate between the stations. Each car holds 18 to 25 passengers in one compartment, and the ride takes a few minutes at about 4 mph. The upper station on Mount Washington has an observation deck facing Pittsburgh's Golden Triangle.

The track gauge measures 5 feet (1524 millimeters), a width common in Finland and Russia but rare in United States railway systems. This uncommon width was likely chosen to provide added stability on the steep gradient.