in the extreme eastern part of the region also co-signed with I-70): It's also served by several Interstate spur routes: (future) Other expressways serving west area commuters from Steubenville, Ohio, through West Virginia and into the metro area of Washington County, Pennsylvania, and into Allegheny merging into I-376. in the Greensburg area and co-signed with I-376 through the city and western suburbs. along the Ohio River in Jefferson County, Ohio. serving the Allegheny Valley commuters in the Northeast and through suburban Armstrong County. a 70 mile long interstate grade route between the south hills and West Virginia. serving commuters along the Ohio River valley to the northwest of the city. as a partial east hills beltway for traffic from both Interstate 70 and the Pennsylvania Turnpike/Interstate 76. Fort Duquesne Boulevard serving as a downtown expressway between I-279 and I-579. Port The Port of Pittsburgh ranks as the 21st-largest port in the United States with almost 34 million short tons of river cargo for 2011, the port ranked 9th-largest in the U.S. when measured in domestic trade. Mass transit The Pittsburgh Regional Transit agency (PRT) is the largest mass transit service in the metro area and includes a 26-mile subway/light rail system, all serving the central core. This system is complemented by the Butler Transit Authority and Town & Country Transit to north destinations, Beaver County Transit Authority and New Castle Area Transit Authority to northwest destinations, Westmoreland County Transit Authority and IndiGo to eastern destinations, and Washington City Transit, Mid Mon Valley Transit Authority and Fayette Area Coordinated Transportation serving southern destinations. The University of Pittsburgh Transportation System also provides services in the eastern core of the metropolitan area while Mountain Line Transit serves the city, western suburbs and an express route south to Morgantown, West Virginia. A metro map of all fixed route transit routes for Pennsylvania counties can be found here. Rail Amtrak serves the region with stops at Penn Station in Downtown Pittsburgh, Connellsville to the southeast and both Greensburg and Latrobe to the east. Freight rail is a major industry for the area with the Pittsburgh Line and the Conway Yard among other infrastructure serving the region. Interstate bus Both the Greyhound Lines and Megabus serve the area. Recreation & rail trails Deckers Creek Trail Great Allegheny Passage Mon River Trail Montour Trail Ohio River Trail Ohio River Water Trail Panhandle Trail Stavich Bike Trail Three