
Subway Lines
On of the most popular means of transportation which is chosen by tourists and locals, alike while in the city of New York, the main system of Subway in the city is provided by and leased to the firm known as the New York City Transit Authority.
Fast and connected to almost every part of the city of New York, the system of subway in the city can be said to be the lifeline of New York. So, in case you are planning to travel to New York, it is imperative that you research on the subway lines which ply through the city to be able to travel independently all around New York.
General information on subway lines
http://en.wikipedia.org/wiki/Second_Avenue_Subway
MetroCard information
http://en.wikipedia.org/wiki/New_York_City_Subway#Lines_and_routes
The fare that is involved in travelling through the system of subway within the city is quite reasonable as well. You can also opt for a subscription of the conveniently designed MetroCard, which provides discounts on bulk tickets for regular passengers. The MetroCard can help you make a one time economical purchase of tickets for a specified period, generally a week or a month.
Tourism and subway
http://mta.info/metrocard/tourism/index.html
The subway system in the city of New York is completely accessible for everyone, as well as for individuals with any kinds of disabilities.
It is also a favourite of tourists from all around the world as the helpful signs which are displayed all along the routes of the subway help them to both find their way around this bustling metropolis as well as gather more knowledge about the city thanks to the fantastic trivia that is scattered here and there by the Subway authorities. In fact the subway lines can be quite a tourist attraction by themselves and are often recommended as a part the travel package to New York City.
Have fun out there!

