When i graded the track it took about 9 months to fix i graded it filled knowing they would come back but i just keeped grading each time the holes got smaller its like a road it takes time to fill a hole just putting lose metal in a hole and selling wont becaus when it packed back down you got the hole again and rollers wont work you can stand on a 100 nails picking up but you can’t stand on one nailed standing up the 100 nails the weight is spread you need to grade then roll then grade and roll to the holes stop its the only way to fix a road but the contractors dont want to fix the roads it would lower profits in the futrea