The New York City Fire Department faces highly multifaceted firefighting challenges in many ways unique to New York. In addition to responding to building types that range from wood-frame single family homes to high-rise structures, there are many secluded bridges and tunnels, as well as large parks and wooded areas that can give rise to brush fires. New York is also home to one of the largest subway systems in the world, consisting of hundreds of miles of tunnel with electrified track.

New York is home to what largest transportation system in the world?