The route's origins begin when the streetcar lines running on Washington Street and Maple Avenue were combined into a single service in 1912, running through Downtown.

[2] Thus, the Maple and Heliotrope line consisted of tracks on Melrose; Heliotrope; Temple; New Hampshire; First; Bimini Place; a private right of way; 2nd; Rampart; 6th; Alvarado; 7th; Maple; Woodlawn; Santa Barbara; Wall; and 53rd.

[4][5] Service between First and the University of California was temporarily discontinued in the summer of 1924 amid citywide power cuts.

This routing pattern held until August 3, 1947 when service was discontinued.

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