User: What types of public transportation are available in Lisbon?
Assistant: The city has a comprehensive public transport network, including buses, trams, and subways, though the subway network does not yet reach through all areas of the city. Lisbon's most extensive public transportation network is the Baixa-Chiado Metro with sixteen stations, as well as the historic 18th-century Carris Tramway system and an express bus line. There are several tourist bus lines available as well, including night bus service and bus tours of the city, and there are also some regional train lines, including the popular scenic line from Sintra to Cascais. Additionally, Lisbon has the second-most extensive ferry network in Europe, with the main passenger apportioned to the Azambuja-Sacavém line.