One major contrast is in the sister cities' transit systems. Despite having fewer rail lines and stations, Toronto's public transit ridership has seen years of steady passenger growth — up 15 percent from 2008 to 2015, while the CTA's is down 1.6 percent over the same period. With 2.7 million daily boardings compared with the CTA's 1.6 million, the Toronto Transit Commission, or TTC, has become the busiest system in North America, after New York City and Mexico City.