... to be used with care, but they are often quite good and don't deserve the criticism they sometimes receive. In any event, in many cases they are the best we have, and it's great that the NLS now make almost the whole country available, and free for personal use. The most accurate parts of the maps are the marked switch toes. They will have been surveyed by chaining along the tracks, and length-wise can be taken to be accurate, unless you have clear photographic evidence to the contrary: 2_031032_290000000.png V-crossing noses are not often explicitly marked, so their apparent position is determined by the accuracy of the drawn rail lines, which can often leave something to be desired. It's easy to see if the track gauge has been drawn accurately to scale, by aligning a P4 (or S7 etc.) template over it. If it is, it's reasonable to assume that the track spacing is also drawn to scale. If not, you can usually assume that the track is at 6ft way (11ft-2in ...