"[3] Notable buildings located along Madison Street include the Carson, Pirie, Scott and Company Building,[4] Chase Tower, Three First National Plaza, the Chicago Civic Opera House, Citigroup Center and the United Center.[6] Madison Street was home to some of the earliest transit in Chicago, having a horse car service starting from 1859.[6] A branch line diverging from the main service on Fifth Avenue joined the main line downtown starting August 19, 1906, after having previously been a shuttle; staying a shuttle during the night, it reverted to that status on Sundays starting April 24, 1932.[8] As of 1928, the main line had owl service between 1:01 and 5:20 a.m., during which cars ran for every ten minutes, but the Fifth Avenue branch did not, the last eastbound through-route car departing its western terminus of Crawford Avenue at 12:40 a.m. and the last westbound shuttle departing Madison at 2:00 a.m.;[9] during the day, streetcar lines in Chicago typically had intervals of between eight and fifteen minutes.[6] Buses replaced main line streetcars on weekends starting May 11, 1952 – simultaneous with the Fifth Avenue branch's replacement by buses on Saturdays – and altogether on December 13, 1953, whereupon the Fifth Avenue branch became a shuttle service at all times before it too was discontinued on February 22, 1954.