In the 1921 lettering scheme, E was assigned to a route running from Eagle Rock to Hawthorne.

This service was re-designated as route 5 after 1932, and is further discussed in greater detail in its own article.

[1] Line 33 started as a new service in 1920, formed from tracks on Euclid, 4th, and Evergreen.

The line served as a branch of the F. By 1924, the route was extended north to terminate at Ramona Boulevard and Miller Avenue.

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