The following post shows the CD 154 Whitall Tatum No.1 which was used in large numbers on the Central of Georgia Railway telegraph lines (1968). The aqua CD 154 insulators can be found on all sections of the Central of Georgia Railway [id=604447373] as well as most other Georgia railway telegraph lines - Georgia Southern Railway etc. The aqua colored units were used in massive numbers and I think they were the earliest CD 154 WT's used on the Georgia telegraph lines.

The peach and honey amber CD 154 Whitall Tatum units were not that common, but were found on telegraph lines on all the Central of Georgia lines that I hunted in Georgia. None were found on other railway telegraph lines in Georgia.

Although I found SCA CD 154 WT units on all Central of Georgia lines, they were not used on any of the other railway lines which I hunted in Georgia. The only section, where the SCA / purple units were used in massive numbers, was the 120 mile section between Macon and Albany, Georgia. In this section, there were five cross-arms on each pole. The bottom cross-arm carried only low voltage power type insulators for the signals and the next cross-arm carried ONLY CD 154 WT's in purple (i.e 8 insulators on this cross-arm). I don't know the spacing between poles, but I will assume that it might be 10 yards (30 feet). I calculate that there were 176 poles per mile or 21,120 poles between Macon and Albany. This means that 168,960 purple WT's were used. If the lineman that wrecked out this line in the 1990's kept these insulator and sold these insulators on e-Bay at $40 to $60 each, they would now be very rich. If you know the true distance between poles, you can re-calculate the number of CD 154 WT's used.