The Union Railroad Clairton Bridge, commonly known as the Clairton Coke Works Bridge, is a truss bridge

Truss bridge

A truss bridge is a bridge composed of connected elements which may be stressed from tension, compression, or sometimes both in response to dynamic loads. Truss bridges are one of the oldest types of modern bridges...

 that formerly carried the Pennsylvania Union Railroad

Union Railroad (Pittsburgh, Pennsylvania)

The Union Railroad is a Class III switching railroad located in Allegheny County in Western Pennsylvania. The company is owned by Transtar, Inc., which is itself a subsidiary of USS Corp, more popularly known as United States Steel...

 between Clairton, Pennsylvania

Clairton, Pennsylvania

Clairton is a city in Allegheny County, Pennsylvania, United States, along the Monongahela River. It is part of the Pittsburgh Metropolitan Area. The population was 6,796 at the 2010 census. Under Pennsylvania legal classifications for local governments, Clairton is considered a third-class city...

 and Glassport, Pennsylvania

Glassport, Pennsylvania

Glassport is a borough in Allegheny County, Pennsylvania, United States, approximately south of Pittsburgh and the confluence of the Monongahela and Allegheny rivers where they form the Ohio River...

. The structure, which featured a single track, has been out of service since the 1970s, as rail traffic was rerouted to the US Steel Clairton Works as the steel industry began to decline. The bridge is currently slated to become part of the Montour Trail

Montour Trail

The Montour Trail is a multi-use recreational rail trail near Pittsburgh, Pennsylvania.It has a crushed limestone surface, appropriate for bicycling, walking, running, and cross-country skiing. Eventually, this trail segment will extend from Coraopolis, Pennsylvania to Clairton, Pennsylvania.The...

, one of many current Pittsburgh-area bike trails projects.