The photographed line was a twin in basic construction to the famous "Orange Line" which employed CD 267 and CD 267.5 insulators. The latter was completed in 1899. Beneath planked catwalks on the inside between each of the inbound/outbound tracks is where the super-dooper-cloth insulated twisted copper cables were installed for transit operation in both directions (for the Orange Line installation). The cables were draped at approximate eight-to 16 foot intervals within the saddles of CD 267, CD 267.5 and heavy porcelain white cleat insulators.

This photo is shown as an example of how the "Orange Line" approximately once looked (demolition was completed in 1989). The stations as you see looked much the same. In addition to their period historical construction these above-ground stations had a very nice look to their green-patina copper roofing. At least one or more of these stations remained intact and were relocated to a well known railway museum in Kennebunk, ME.

The above actually was the Atlantic Avenue section of the Boston Elevated Railway. I presently have no information regarding its history nor the insulators used to power it.