The New York City subway system carries more than 2 billion each year on 24 subway lines that cover 659 miles of track and service 468 stations.
By comparison, the second busiest public transit system in the United States is Washington, D.C.'s Metrorail system, which carries more than 200 million passengers per year. The D.C. Metro system has 103 miles and 86 stations.
Lhota is a former aide to New York City Mayor Rudy Guiliani (R).
Former NYC subway chief wins GOP mayoral primary
By Keith Laing - 09/11/13 12:23 PM EDT