couven92 wrote:
I also noticed that they are not added to the dependencies of the generated route, but they just magically appear in the route when their KUIDs are available in Content Manager.
Not quite. There is a dependency, as there must me. Otherwise Trainz Surveyor wouldn't know that a particular UTM tile exists and where to render it. The dependency is placed into the .obs file, with KUID, position, height and rotation. When you save a route in Surveyor, Trainz iterates all those dependencies and recreates the dependency list. So, not magic here.
couven92 wrote:
and when I am done and upload it to DLS, the tiles will no longer part of the route for others who download it, correct?
That would yield missing dependencies but will probably not cause any harm. But you better remove these assets from your route before uploading for a clean deployment package.