CCG/Kind: Mesh
From TrainzOnline
KIND: MESH
These are meshes that are never referenced through Surveyor panels but are referenced by KUID from another asset.
It could be referenced through the preview-mesh-kuid tag (like the airport does) or as a kind attachment effect like that of fixed-tracks.
Typical mesh config.txt
kuid <KUID:-3:10092> kind "mesh" mesh-table { default { mesh "arrow.im" auto-create 1 } }