Note the CD 257 "Mickey" and the large cable insulator on the other side of the crossarm. The smaller insulators likely were part of the interurban's private telephone line system used for transit car dispatching from their phones mounted on poles' lower sections.

To view the original photo showing the rest of this crew; linemen working on the trolley mastarm and other surroundings [id=678754145].

The next photo is the same image from a bit stepped-back vantage point showing more of the pole and lineman.