The 2 train travels between New York's "Two Cities"

... ride the 2 train from prosperity to poverty. The neighborhood surrounding the 2 train Chambers Street stop in Tribeca has a median income of $205,192 and is among the city's wealthiest. Fourteen miles further north, around the East 180th Street stop ...

http://www.dailykos.com/story/2013/09/13/1238644/-The-2-train-travels-between-New-York-s-Two-Cities