Since opening in 1976, the Metrorail network has grown to include six lines, 91 stations, and of track. It is the Second-busiest rapid transit system in the United States in number of passenger trips, after only the New York City Subway. The record for daily ridership was 1.12 million on January 20, 2009, the day of Barack Obama's first Presidential Inauguration, followed by the Women's March on January 21, 2017, with 1,001,613 trips. In 2016, Metrorail had nearly 180 million trips. Fares vary based on the distance traveled and the time of day. Riders enter and exit the system using a proximity card known as SmarTrip. SmarTrip cards can also be used on a smartphone through Apple Pay and Google Pay. magnetic stripe tickets stopped being accepted on March 6, 2016. Metrorail's frequency of service and fares vary depending on the available subsidy, the particular transit line, and the distance traveled.