The Pasadena via Oak Knoll Line was an interurban route of the Pacific Electric Railway.

The routing was reverted after that, but rear cars of a few rush hour trains continued until January 18, 1941.

Trains would continue to run to the Main Street Terminal every New Years Day to serve passengers traveling to the Tournament of Roses Parade.

[3] Service was largely discontinued after October 8, 1950 with a single round trip operating between Pasadena and El Molino to maintain the franchise.

At this point, the line proceeded north in the pavement of city streets, running on Oak Knoll Avenue (with a short section of private right of way between Canon Drive and Arden Road that passed to the north of Oak Knoll Circle's meandering curves) and South Lake Avenue as far as Colorado Street.

It then turned west and ran on Colorado Street through the Pasadena business district to Fair Oaks Avenue.