The New York City Subway is one of the most extensive public transportation systems in the world, with 468 reported passenger stations and a total of 842 miles including non-revenue trackage. The subway is also notable for being among the few rapid transit systems in the world to run 24 hours a day, 365 days a year. It has nearly twice as many daily riders as every other rapid transit system in the United States combined.

A great vehicle for transportation but a more difficult place to find someone hiding from the authorities. Skylar soon finds it a resource for his personal acts of violent revenge.