These are two CD 151 W. Brookfield signal style insulators which were used on the Central of Georgia Railway telegraph line. The insulator on the left is a CD 151 front skirt embossed "W. Brookfield" and back skirt embossed "New York" in light green with a "0" mould mark on the top of the dome. The insulator on the right is a CD 151 from dome embossed "1 / W. Brookfield (arch) / New York" in a medium powder blue. The CD 151 was found on every section of the Central of Georgia Railway main lines in fairly high numbers. There were several spur lines which did not have CD 151's. The skirt embossed unit was found in every shade of aqua, aqua green, and the light green unit shown in the photo. The dome embossed unit was found in various shade of aqua including the nice Brookfield powder blue unit shown in the photo. The skirt embossed CD 151 was found in larger numbers than was the CD 151 dome embossed Brookfield.