Bellevue, Ohio Re-Signaling

Apparently NS isn't just out to ruin the spiritual heart of the PRR, but has also decided to go after their Nickel Plate Road heritage as well.  The major NKP freight classification hub and junction at Bellevue, OH is seeing further further resignaling efforts that will see the fall of many of the classic NKP signals including the bracket mast at the Slaughterhouse Road hotspot south of the city.  Ok, I get it that position lights and interlocking towers cost more and one can save money by eliminating them, but why is NS replacing traffic light signals with more traffic light signals?  Did they get a special discount on a bulk order down at the costco?