Iam afraid there is not one, as NS uses a farebase based on the KMs (of course noone ever used miles here), but on some routes these are heavily biased to make parrallel routes equal.
A few years ago ARRIVA issued a passenger guide which had then the latest maps-schematic-with all ''tariefKms'' on it. That was about the last one I know of.
Did not know of this site quoted above, but that clearly shows the exact Km(as do the signs along the lines), but its quite a drag to find Kms covered on it for complicated routings.