Former NYC subway chief makes mayoral run official

Lhota is a former aide to New York City Mayor Rudy Guiliani (R). He is thought to have a good shot at replacing Bloomberg because of his name recognition from running the largest and busiest transit system in the U.S. 

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 U.S. is Washington, D.C.'s Metrorail system, which carries more than 200 million passengers per year. The DC Metro system has 103 miles and 86 stations.

Lhota said on his campaign website that he was running for New York City Mayor because “I love this City – I love its diversity and optimism, and the opportunity it represents.”