Sorry, the only track in America that is in that bad of condition is old track that is seldom used and will have a restricted speed limit. Mainline track in America is much smoother and well maintained. Stovepipe is right. This should be a feature available to track creators if they want to create old and badly maintained track. It should be just like the different variants of rusty track on the DLS. Making the default value 50% is just wrong on every level. And suggesting that users should have to modify track to fix the problems is crazy. But I can still remember how many requests there were for this feature so I can understand why it was implemented but the default should be more like 5% and the creator can change it to make their track appear to be rusty unstable track.