Nah, I saw your post, and it does make sense - however, I tried to install the 49922 - 61388 and it comes up with
Querying installed Trainz versions, please wait...This patch file is not applicable to your current installation version.
Even though when I launch TS12, it clearly shows Build 49922 in the lower right of the screen, so what I'll do is re-install the game, and see if that does anything. If not then I'll contact Customer Support
Cheers for the help