roar of the four
n.— «This photo taken around 1940 shows the old “roar of the four” as folks referred to it when four streetcar tracks, two privately owned and two public, dominated the center of the street.» —“Will We Ever Get Market Street Right?” by Chris Carlsson SF.Streetsblog (San Francisco, California) Mar. 23, 2009. (source: Double-Tongued Dictionary)