Got the same problem as EDL.
Installed SP3.
Installed Blue Comet.
I can view the train in railyard.
I ran an extended repair.
I see the kuids in Content manager.
But if I start a route in editing mode and open the trains tab, none off the locs or coaches displays.
What now?
Sorry Guys.
Tried again.
Found a tiny icon at the top: filter
Opend it and deleted filter, and there he is!
I think the route I wanted to edit had a default filter set, as I didn't know it existed.
Thanks.
Assuming you downloaded SP3 to a folder on you hard drive, open Windows Explorer and find where you stored 42203 to 43434.exe (if that is your download) and double click it to run the installation.
Sometimes the patcher is looking in the wrong folder. This can happen if trainz.exe was not installed in the default folder. Use the button with the "..." on the patcher to find the correct trainz.exe