Annandale Boulevard in Pasadena can be seen on the 1928 street map on the left below. It's now part of N Figueroa Boulevard. The Google Maps view on the right is at a different scale, but it shows Rockdale Avenue intersecting with N Figueroa just above the center, so I'd guess that the Gilmore station was in this area.
www.bigmapblog.com/Google Maps