Welcome to the exact same problems I have with Trainz
MSTS is heaps better at lease a full route or rolling stock can be downloaded without having to download over 2 million dependencies for a single route in Trainz or 200 to get rolling stock to work "if you haven't noticed 2 million and 200 is a figure of speech"
I have lost complete patience using Trainz, I still have routes and rolling stock missing dependencies just to get them to work correctly
Trainz has it's good things, but just downloading dependencies is a pain in the lower back!
My advice, get yourself a different Train Sim and tell Auran to either put Trainz in a place where the sun doesn't shine or allow a COMPLETE download for a single route and rolling stock without the need of bloody dependencies
If however, you do get some luck try clicking on TRS2006 and untick all other versions of Trainz in the download station and hopefully it'll work for you mate... Best of luck!!!