I tried the Wiki but it is a collection of confusion. 
First - are higher values good or bad? Then, does this have a physical effect on the actual quality of the track?
Is there a functional effect on trains traveling on track with some settings of condition? Can a train refuse to travel on a "bad track" under AI control?
				
			First - are higher values good or bad? Then, does this have a physical effect on the actual quality of the track?
Is there a functional effect on trains traveling on track with some settings of condition? Can a train refuse to travel on a "bad track" under AI control?
 
	