Sounder commuter rail is a commuter rail service operated by BNSF on behalf of Sound Transit. Service operates Monday through Friday during peak hours from Seattle, Washington, north to Everett and south to Lakewood. In , the system had a ridership of , or about per weekday as of . , schedules serve the traditional peak commutes, with most trains running inbound to Seattle in the morning and outbound in the afternoon. Three daily round-trips run the reverse commute to and from Tacoma. Additional Sounder trains operate on some Saturdays and Sundays for travel to and from Seahawks and Sounders games at Lumen Field and Mariners games at T-Mobile Park. Both stadiums are a short walk from King Street Station. Service history S Line The S Line (formerly the South Line) began service with two round trip trains on September 18, 2000, with stops in Tacoma, Sumner and Auburn that terminated in Seattle. Puyallup and Kent stations were added February 5, 2001, with Tukwila being added March 12, 2001. There are currently thirteen round trips on the S Line, with three operating in the reverse commute direction. In July 2010, Sound Transit reached a new agreement with BNSF, valued at $185 million, which grants Sound Transit permanent access to the S Line corridor, as well as allowing four more daily round trips to begin, starting in 2012 and continuing through 2017. On October 8, 2012, the extension to South Tacoma and Lakewood stations was inaugurated, with five daily round trips, all of which are in the peak direction, serving the new stations. In September 2016, a mid-day round trip was added between Lakewood and Seattle. In September 2017, two additional round trips were added, bringing the total to eight daily round trips servicing the Lakewood extension. The average weekday ridership in 2010 on the S Line was 8,300, down 7% from 2009 due to continued low employment in Downtown Seattle. Since then the average ridership has increased and as of October 2015 stood at 14,500 per day. In 2019, S Line ridership was 16,419 per day. N Line The Everett-to-Seattle N line (formerly North Line) started with a Seahawks game train on December 21, 2003. Regular service started on December 22 with one morning train to Seattle and one evening train back. A second round trip train was added on June 6, 2005, to help increase ridership, a third was