What is the best way to instatiate an array of connected GameObjects?

Im trying to create a 2d side scroller with telephone poles placed along a road with a wires connecting between each pole. The poles and wires need to be dynamically created as the camera moves further to the right. I already have a function that creates a wire between two positions.

this is basicly what im trying to do:

 update{
     if(camera.position.x > last_pole.x)
     {
         //create pole
         new_pole_position = last_pole.x + 20;
         new_pole = instantiate(pole, new_pole_position)
 
         //connect wire between new pole and last pole
         create_wire(last_pole, new_pole)
     }
 }

What is the best way to create a collection of GameObjects where I can easily access the the newest and previous created GameObject?