Thanks...
Check US Locomotive Works and Trainz Pro Routes.
You need to register to download but the access is free.
The first item: <kuid:106916:10466> is located on USLW.
I had no luck with the others.
In the past, I have looked up the author on the DLS, just using his/her KUID for the asset KUID. This usually leads me to other sources such as TrainzDepot or even Trainz Iberia for assets.
Good luck and sorry I couldn't be more helpful.
John