Most of the wires atop this pole were owned by the public electric utility in Kennebunk, Maine currently serving around 4,000 customers by the coast, about 25 miles south of Portland.

I strongly think the gooseneck lamp that is mounted right above the fire alarm box in view had a red lens as part of the luminaire to identify this alarm box location. These were somewhat commonplace decades ago. They were wired (often in electrical series) with regular street series lighting circuits. So, they came on when the street lights did. The only difference is that some of these red-glass refractored lights had lower output lightbulbs within them...not needing to be as bright as regular streetlamps. For many years 320 and 600 lumen 6.6 ampere street lighting bulbs were used for these locations. An interesting fact is that Sylvania made these specialty lightbulbs up until the late 1970s!

The low-mounted two-pin crossarm on this pole led the two wires to the fire box indicator light.

FYI...The City of Boston *still* uses wood-pole mounted incandescent street lighting fixtures (albeit a lot newer than the one you see here) with red plastic lenses to ID fire alarm box locations. Their boxes run on a Gamewell system and the City is adamant about keeping their fire alarm system in service as are many other bigger cities here in the Northeast. The Boston fire alarm fixtures operate on a regular 120V photoelectric street lighting control.