 The major Spanish-language networks are Univision – WUVP-DT, UniMás – WFPA-CD, and Telemundo – WWSI-TV., the city is the nation's fourth-largest consumer in media market, as ranked by the Nielsen Media Research firm, with nearly 2.9 million TV households.Philadelphia is served by the Southeastern Pennsylvania Transportation Authority (SEPTA) which operates buses, trains, rapid transit (subway and elevated trains), trolleys, and trackless trolleys (electric buses) throughout Philadelphia, the four Pennsylvania suburban counties of Bucks, Chester, Delaware, and Montgomery, in addition to service to Mercer County, New Jersey (Trenton) and New Castle County, Delaware (Wilmington and Newark, Delaware).