Later-era lighter track
What's different about Cortland is the housing stock behind the door. The wider Warren service area runs mostly 1960s-70s, but Cortland's median build year runs later, closer to 1981. That means more doors here came in on steel track with nylon or steel-ball rollers rather than the older plain-bearing stamped-steel rollers you find on the 1960s houses closer to Warren.
