1.6.3.0 is now out of Beta testing. Restart Steam and Enjoy! Thanks again to all those that help test the many beta versions.
Many hours have gone into this to provide an interface that allows plugin for the height and image data. Image plugin is threaded so you can begin working on the tracks before the terrain has completed getting the image data.
Bezier curves give you more control over the track curve.
New Track Import function takes the old BTB concept and adds smarts to break up track into smaller pieces and smartly places nodes and control points to better represent the track.
A few bugs fixed and some minor enhancements made.
And the next release after this is not too far away. :)