 The Metropolitan Transit Authority of Harris County, Texas, or METRO, provides public transportation in the form of buses, trolleys, and lift vans.METRO began running light rail service (METRORail) on January 1, 2004.Currently, the track is rather short — about 22.7 miles (20.6 km) from Northline Transit Center Station through downtown Houston to the Texas Medical Center and Reliant Park, and lines from downtown to the East End and the University of Houston/Lower 3rd Ward.