Norfolk Southern Lake Pontchartrain bridge
Encyclopedia
The Norfolk Southern Lake Pontchartrain Bridge is a bridge
Bridge
A bridge is a structure built to span physical obstacles such as a body of water, valley, or road, for the purpose of providing passage over the obstacle...

 that carries a single-track of Norfolk Southern rail line between Slidell and New Orleans, Louisiana. At 5.8 miles long, it is the longest railroad bridge in the United States and likely the longest rail bridge over water on Earth. The Huey P. Long Bridge
Huey P. Long Bridge (Jefferson Parish)
The Huey P. Long Bridge in Jefferson Parish, Louisiana, is a cantilevered steel through truss bridge that carries a two-track railroad line over the Mississippi River at mile 106.1 with two lanes of US 90 on each side of the central tracks....

 in New Orleans has sometimes been given that title, but at about 4.4 miles, that bridge is considerably shorter than the Norfolk Southern bridge.

The bridge is heavily used by Norfolk Southern freight trains. In addition, Amtrak
Amtrak
The National Railroad Passenger Corporation, doing business as Amtrak , is a government-owned corporation that was organized on May 1, 1971, to provide intercity passenger train service in the United States. "Amtrak" is a portmanteau of the words "America" and "track". It is headquartered at Union...

's Crescent passenger train crosses the bridge once daily in each direction.

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