Monongahela Incline, c. 1900. Carnegie Museum of Art. 
On This Day in Pittsburgh History: May 28, 1870
The Monongahela Incline, opened on May 28, 1870, was the first incline constructed in Pittsburgh. The incline, one of seventeen inclines in Pittsburgh at one time, climbs a 35 percent grade, one of the steepest incline planes in the world. Today, only two inclines remain in Pittsburgh. [Explore PA History] 

Monongahela Incline, c. 1900. Carnegie Museum of Art. 

On This Day in Pittsburgh History: May 28, 1870

The Monongahela Incline, opened on May 28, 1870, was the first incline constructed in Pittsburgh. The incline, one of seventeen inclines in Pittsburgh at one time, climbs a 35 percent grade, one of the steepest incline planes in the world. Today, only two inclines remain in Pittsburgh. [Explore PA History