Hi netting2010,
Firstly, I did receive your feedback OK, and I thought that it's best if I respond via the forums.
Upgrading from TRS2006 to TS12 can be done, but as stated above it is a process that can result in a lot of faulty content.
For built-in content, see my tutorial website (
http://trainz.shaneturner.co.uk/tutorials/index.php/importing-content---the-different-methods) and follow the instructions under the heading 'Copying Built-in files from an earlier version')
For non-builtin content you can import the older content from TRS2006 using the Import Content option in Content Manager. Bear in mind that quite a bit of it is likely to be faulty, and must be fixed if you intend to use it. Some of the content though has been fixed through the Download Station Cleanup project, and can be updated using the in-game Content Updates option.
Shane