The MTA- the Most Extensive Transportation Network in the U.S.
The Metropolitan Transportation Authority (MTA), located in New York City, is one of the country’s largest transportation networks. It spans across 5000 square miles, connecting points throughout the five boroughs of New York City and Long Island. The MTA includes both the train and bus networks, which serve billions of people annually. The bus system has a total of 47 different routes that travel in the Bronx, Brooklyn, and Queens, and 35 express bus routes going to and from Manhattan. The subway system is even more extensive. There are 24 subway lines and a whopping 468 subway stations. In addition, the MTA Long Island Railroad has 11 lines that provide transportation for Long Island residents.
A way to analyze the MTA as graphs may be to designate each station (bus or train) to be nodes. The route connecting these nodes would serve as the edges. Overall, the graph would be a very convoluted expanse of overlapping lines and circles. The last two links below are maps and show what the subway and bus networks would look like. Another perspective would be considering each type of transportation (bus, subway, railroad) as a subset of the MTA. There would be separate trees and branches stemming from these nodes, starting with the MTA and going down to borough section and then to individual stations. This transportation network is one reason why New York City is considered the world center of finance.
http://web.mta.info/mta/network.htm
http://media.nbcnewyork.com/images/1200*746/subway-map-half.jpg
http://web.mta.info/nyct/maps/manbus.pdf
