New track, eh? This makes me even more curious than before. As I stated in a previous post, Colossos was built using glue laminated timber ("glulam" for short). I don't know if that was just the track or the supporting structure as well, but I assume it would be kind of wasteful to use in the support structure as traditional wood evidently does the job just fine (ref. every other wooden coaster out there). If the coaster now needs retracking, it appears to have been the glulam that failed. Glulam is a relatively novel building material, it was only used sparsely until the 1990s or so. Could Colossos' problems be due to faulty glulam application?
It would be really interesting to read the engineering report on this. Guess I'd have to learn German first, though...