1887 - Madison Street Railroad Co. reorganized as Madison City Railway Co.
1889 - Madison City Railway Co. begins electrifying lines.
1892 - Electrification of streetcar lines completed.
1897 - Madison City Railway Co. reorganized as Madison Electric Railway Co.
1901 - Madison Electric Railway Co. reorganized as Madison Traction Co.
1904 - Madison Traction Co. sold to Madison & Interurban Traction Co.
1907 - Madison & Interurban Traction Co. remaned Southern Wisconsin Railway Co.
1916 - Southern Wisconsin Railway Co. reorganized as Madison Railways Co.
1923 - First buses in Madison are operated by Wingra Bus Co., when Madison Railways Co. was financially unable to extend its Wingra Park line.
1926 - Madison Railways Co. acquires Wingra Bus Co.
1935 - All streetcar routes converted to buses.
1939 - Madison Railways Co. renamed Madison Bus Co.
1970 - Madison Bus Co. becomes publicly owned Madison Metro.