A not complete list of Killington trail name changes:
Criss Cross & Dipsy Doodle -> Merged into Easy Street.
Goat Path, Rim Run, part of Mouse Run, Skidway, Perimeter, Vale -> All relabeled as Great Northern.
Model C Slope -> Unnamed
West Glade -> Ridge Run
East Glade (Upper) -> Reason
East Glade (Lower) -> (Upper) East Fall.
Off The Top -> Merged into Launchpad.
High Road Left Fork -> Low Road
Upper 4 Way + Skyeway -> ??? Merged into Upper Skyelark I guess.
Lower 4 Way -> Stash Way
Upper Frost Line -> Unnamed entrance to Skyeburst that now ends there.
Lower Frost Line -> Great Eastern -> Bear Trax
Upper Home Stretch -> The Northway
Green Heaven -> Great Eastern -> Bear Trax
Wanderer + Falls Brook -> Bear Cub
Slider -> Grizzly -> Lower Dream Maker
And those are just mid-90s to now changes. If you go back to the 70s and 80s there’s even more.