Possibly those were fire alarm wires on the two-pin crossarm on top. The arc light appears to have been wired via a break-insulator on the right side of the upper 6-pin crossarm. The rest of the circuits were for trolley service with the two having pony insulators (on the upper crossarm on left) for the system's private line telephone dispatching.

Click "Next" for a close view of the two crossarms that were on this pole with a pretty clear look at the CD 259 insulators that were installed here.