Horning, Pennsylvania is an unincorprated town in Allegheny County, Pennsylvania

Allegheny County, Pennsylvania

Allegheny County is a county in the southwestern part of the U.S. state of Pennsylvania. As of the 2010 census, the population was 1,223,348; making it the second most populous county in Pennsylvania, following Philadelphia County. The county seat is Pittsburgh...

. It was the residence of miners of the Pittsburgh Terminal Railroad and Coal Company #4 Mine, which had a racially integrated workforce, unusual in that era.

"D" Mine (Pittsbrugh Terminal Coal Company #4)

Horning was founded at the opening of a coal mine along the West Side Belt Railroad

West Side Belt Railroad

The West Side Belt Railroad was a standard gauge railroad incorporated July 25, 1895. It ran from Temperanceville, to Clairton, Pennsylvania, with a branch to Banksville. It acquired the Little Saw Mill Run Railroad by merger in 1897, and the Bruce and Clairton Railroad in 1901. The railroad was...

 by the Pittsburg Terminal Coal Company

Terminal Coal Company

The Terminal Coal Company was a coal mining company in Allegheny County, Pennsylvania. It operated mines in the Pittsburgh Coalfield, including mines in Becks Run and Horning, Pennsylvania. Unusually for that time in Pennsylvania, it hired African-American miners for some of its work....

, about 1903. In 1905, Philip Murray

Philip Murray

Philip Murray was a Scottish born steelworker and an American labor leader. He was the first president of the Steel Workers Organizing Committee , the first president of the United Steelworkers of America , and the longest-serving president of the Congress of Industrial Organizations .-Early...

 was elected president of the United Mine Workers of America local in Horning.
On February 3, 1926, 20 miners were killed in an explosion in this mine. It was the scene of armed labor unrest in 1928. The mine was closed October 5, 1939.