If you edit your trainzOptions.txt file to add the tag
-showkuids
then when you click to get an asset, it will show the kuid number. As an example, I downloaded 42 Track marshalling yard,<kuid:97008:1102>, opened the route for edit and clicked on the Track to get this identification of the track:
1-bibloque, GRIS SUCIA,<kuid:86311:38006>.
Bob