Create Centerlines of a Polygon Buffer Feature, ArcGIS 10.3

I have seen another method for this to create centerlines, but that involved splitting the line and deleting the line closures. This is a huge network and the time involved in that would be impossible.I was hoping there was another method that I could not find that someone would help me out with, possibly new with 10.3.
I have ArcMap Advanced with Spatial Analysis and 3D Analyst extensions.
Example of part of network below.