The beginnings of the route begin in 1910 when the Los Angeles Railway acquired the Angeleno Heights and Crown Hill Lines from the Los Angeles Inter-Urban Electric Railway, combining them into one service.

It operated on a winding circle route in and north of Downtown Los Angeles with a branch to Kensington Road and Douglas Street – cars terminated at their second stop at Bellevue Avenue and East Edgeware Road.

Under the new naming scheme adopted in 1921, the line was designated the letter C. The route operated from Douglas Street and Kensington Road via Douglas to Edgeware; Bellevue; Beaudry; Alpine; Figueroa; Boston; Bunker Hill; California; Hill; Temple; North Broadway; 1st; Hill; 5th; Olive; 6th; Flower; 3rd; Boylston; Crown Hill; Columbia; 2nd; Loma Drive; and Belmont as far as Temple.

[1][2] Track on the Echo Park Line was abandoned later in the year and the circle was broken, with a cars terminating at Temple Street and Belmont Avenue.

In 1927, the Kensington Road and Douglas Street of Temple was transferred to the G. Service was rerouted downtown to rebuild the lines for eight months starting in 1931.