The shorter pole on the left looks like it primarily was for electric lighting customers. The pole next to it might have been its upcoming replacement. It is also possible the light fixture attached to it might have been an indicator for a fire alarm call box location given its small (colored) glass globe. Similar fixtures have been used for many decades thereafter in the US for this purpose. Their lightbulbs connected to the local street lighting circuit for dusk-to-dawn illuminaton and were of somewhat lower light output as desired for filtering through the lens' red or blue glass "jar" shaped globe.

FYI, Boston, NYC and many other East Coast communities *still* use overhead brightly colored lights to indicate their fire alarm telegraph and emergency call box locations.