[6][5] Starting March 1939 the rear car of some Glendora trains were disconnected to continue to Sierra Madre.

On October 8, 1950 service was virtually abandoned with a single daily round trip running between Sierra Madre and San Marino; this ended on December 28, 1950.

[8] The Sierra Madre Line branched north from the Monrovia–Glendora Line in San Marino and its two tracks ran between the dual roadways of Sierra Madre Boulevard passing Lamanda Park Junction (Colorado Street and Sierra Madre Boulevard) where it met the local East Colorado Street Line.

From this point, the line continued on single track in a northerly direction along a private right of way in the center of Sierra Madre Boulevard to Michillinda Avenue.

There the tracks entered into the pavement of city streets and proceeded on Central Avenue (Sierra Madre Boulevard) to Baldwin Avenue in Sierra Madre, where the station was located on the northwest corner at what's now Kersting Park.