The New York City subway system is a huge rapid transit system. First put into operation in 1904, the New York City subway is one of the world's most extensive public transport systems in combination with its bus operations. The system is comprised of 468 stations with 277 of them  located underground. Although called "the subway," implying underground operations, almost half of the system runs on above-ground rights-of-way. Additionally, the New York city subway system has over 800 miles of track (but uses only 660 miles), more than 31,000 turnstiles and 734 information booths. The New York City subway system is used by almost 4.5 million passengers everyday and is open 24 hours a day seven days a week. It is the most convenient way to travel the city and is far less expensive then taking a taxi. If you are a visitor to New York city, the New York city subway system can seem rather confusing but it is much easier to use than it appears. There are maps available and most people are extremely helpful if you need to ask questions. Once you are familiar with the New York city subway system, you will find it is by far the easiest way to travel the city.