An upper quadrant motor-worked semaphore on a 12ft doll for mounting on an elevated signal platform 22ft above ground level ('NSW cantilevered signal platform, 22ft, covers 2 tracks, A-form post', kuid:368725:20358). The semaphore can take 3 positions over the upper quadrant: horizontal (STOP), 45 degrees (CAUTION) and vertical (PROCEED).
Home and distant 2-position automatic semaphore signals appeared in NSW in the 1900s. Later (1920s?) a 3-position variant for use in areas with higher traffic densities started to appear. These were double-light semaphore signals where the lower light was a white-light lamp with a red/green spectacle arm or a 2-colour electric light in place of a distant semaphore. The semaphore had 3 positions but the 3 spectacles showed only 2 colours (red, green, green). By day, CAUTION was indicated by the semaphore at 45 degrees, while at night the light indication was green over red.
If the signal was automatic, it was controlled by a nearby relay hut ('NSWGR automatic signal relay hut', kuid:368725:20070) in which track-circuit detections were converted into signal-motor instructions to set the semaphore position.