What was the problem you where having?. Tell us what you think needs "fixing" in TRS2006 and someone in the Trainz community might be able to help you...
(No matter what problem you had before re-installing, it's highly likely that someone else in the community would have had the same problem, so give us some details and someone might have a simple solution/work around so that it doesn't happen again)...
To the best of my knowledge, Auran don't plan on issuing a SP2 for TRS2006. Most of Auran's time & resources are going into the development of TRS2009. (So if we can't find a fix, we might not see you back till TRS2009 comes out)...
Cheers, Mac...