Mount Lebanon was a farming community until the arrival of streetcar lines, the first line to Pittsburgh opening on July 1, 1901 followed by a second in 1924. After the arrival of the streetcar lines, which enabled daily commuting to and from Downtown Pittsburgh, Mount Lebanon became a streetcar suburb, with the first real estate subdivision being laid out in November 1901. Further, the opening of the Liberty Tubes in 1924 allowed easy automobile access to Pittsburgh. Between the 1920 and 1930 censuses, the township's population skyrocketed from 2,258 to 13,403. Today, Pittsburgh's mass transit agency, the Port Authority of Allegheny County, or PATransit, operates a light rail system whose Red Line, which runs underneath Uptown Mt. Lebanon through the Mt. Lebanon Tunnel, merges with the Blue Line in Pittsburgh's Mt. Washington section. Mt. Lebanon's only platform station, Mt. Lebanon Station, is in Uptown Mt. Lebanon; the adjacent Dormont Junction and Castle Shannon stations are in neighboring municipalities. And as of the census of 2000, there were 33,017 people living in Mt. Lebanon.