| 1873-1910 | The Street Railway History of Los Angeles |
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| 1873 | Spring & Sixth Street Railroad Co. |
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| 1885-1889 | Second Street Cable Railroad |
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| 1886 | Pasadena Street Railroad Company North Fair Oaks Avenue Line (horsecar) |
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| 1886-1888 | Colorado Street Railway Company East Colorado Street Line (horsecar), South Loop Line (horsecar) |
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| 1886-1898 | Temple Street Cable Railway |
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| 1886-1894 | Los Angeles Electric Railway (Pico Electric Railway), Electric Rapid Transit Company, The Belt Line Railway Company |
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| 1886-1894 | Los Angeles and Pacific Railway (Los Angeles Ostrich Farm Railway Company, Los Angeles County Railway Company) |
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| 1886-1901 | Santa Ana, Orange & Tustin Street Railway Company, The Santa Ana & Orange Motor Company, The International Railway Company |
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| 1886-1911 | Riverside & Arlington (Crescent City Railway Company, Hall's Addition Railway Company, Riverside Railway Company, San Bernardino Interurban Railway Company) |
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| 1887-1893 | City Railway Company of Pasadena North Fair Oaks Avenue Line |
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| 1887-1893 | San Gabriel Valley Rapid Transit Railroad |
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| 1888 | Highland Railroad Company North Lake Avenue Line, North Loop Line, Arroyo Seco Line |
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| 1888 | West Second Street Cable Railway |
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| 1888 | Pacific Railway Company |
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| 1889-1896 | Los Angeles Cable Railway Company, Pacific Railway Company |
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| 1890-1895 | Los Angeles Consolidated Electric Railway Company - LACE |
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| 1891 | West Pasadena Railway Company West Colorado & Orange Grove Avenue Line |
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| 1893-1938 | Pasadena & Mount Wilson Railway, Pasadena and Mount Lowe Railway, Pacific Electric Mt. Lowe Division |
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| 1894-1902 | Pasadena & Los Angeles Electric Railway, Los Angeles & Pasadena Electric Railway Company |
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| 1895-1910 | Los Angeles Railway Company - LARy |
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| 1895-1903 | Los Angeles Traction Company |
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| 1897-1902 | Los Angeles & Pasadena Electric Railway, Pasadena Electric |
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| 1896-1911 | Los Angeles Pacific |
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| 1899-1953 | Pacific Electric |
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| 1899-1903 | Redlands Street Railway |
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| 1901-1908 | Playa Del Rey Incline |
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| 1901-1911 | Los Angeles & Redondo |
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| 1901-1969, 1996-2001, 2007- | Angels Flight |
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| 1903-1910 | Los Angeles Inter-Urban Railway (The Los Angeles & Glendale Electric Railway Company, The Los Angeles Traction Company) |
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| 1903-1911 | Redlands Central Railway |
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| 1903-1911 | San Bernardino Valley Traction Company |
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| 1904-1943 | Court Flight |
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| 1904-1918, 1921-1923 | Santa Catalina Incline Railway (Island Mountain Railway, Angel's Flight) |
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| 1909-1919 | Los Angeles & Mt. Washington Incline Railway |
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| 1909-1930 | Glendale & Montrose (Glendale & Eagle Rock) |
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| 1910-1912 | Laurel Canyon Utilities Company |
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| 1910-1929 | Santa Monica—Ocean Park—Venice Electric Tram |
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| 1910-1945 | Los Angeles Railway Corporation - LARy |
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| 1916-1953 | White Bus Lines, Motor Transit Company, Pacific Electric Motor Transit Lines |
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| 1917-1918 | Montecito Railroad Company |
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| 1923-1949 | Los Angeles Motor Bus Company, Los Angeles Motor Coach Company |
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| 1945-1958 | Los Angeles Transit Lines - LATL |
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| 1953-1958 | Metropolitan Coach Lines - MCL, Asbury Rapid Transit (1954-on) |
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| 1958-1963 | Los Angeles Metropolitan Transit Authority - LAMTA - MTA I |
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| 1963-1993 | Southern California Rapid Transit District (No rail operations until Blue Line.) |
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| 1993-on | Los Angeles County Metropolitan Transportation Authority - LACMTA - MTA II - Metro |
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| 1999-on | Los Angeles to Pasadena Blue Line Construction Authority on to Montclair |
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