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Family Activities: Monongahela Incline Attraction. Monongahela Incline. 8 Grandview Ave., Pittsburgh, PA 15211. Enjoy the view of Pittsburgh and the rivers riding up and down the wooded slopes of Mt. Washington. The Monongahela Incline transports commuters and guests in restored cable cars. It is one of the few remaining inclines in the country.
The Monongahela Incline, built in 1870 and still in use today, remains the steepest incline in the world. The adjacent Monongahela Freight Incline was in operation for 51 years, from 1884 to 1935. During the first half of the 20th century the inclines were very popular.Some averaged over 2000 riders a day.ome were for coal transport and others serviced passengers, wagons and freight. Pittsburgh had some of the longest and steepest inclines in the world. Today, only the historic Monongahela Incline, still the world's steepest, and the Duquesne Incline, owned by the Port Authority, are still in existence.