train is highly significant for legacy deployments because it provides a bridge for older APs that do not support newer or Cisco IOS-XE based controllers (like the 9800 series).
The Backbone of Compact Networks: Unpacking the AIR-AP2800-K9-ME-8-5-182-0.tar Air-ap2800-k9-me-8-5-182-0.tar
Usually, a "CAPWAP" image is used when the AP is managed by a physical controller (like a Cisco 3504 or 5520). However, the Air-ap2800-k9-me image turns the AP into a . train is highly significant for legacy deployments because