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Ordinarily, a 6" curb height is prescribed, but this can vary depending on how new the sidewalk is. When a street is first laid, the curb might be 7" to 8" tall, to allow for future repaving. Over time, the street will be paved anew with more and more asphalt, building up to the point that the curb becomes almost level with the street. This would be particularly true on a street that was originally cobbles or come other paving (even concrete slabs); asphalt would have been poured directly over it. <br /> <br />In N scale, 6" is not very tall, and as I've just explained it is not critical to get it exactly 6" above the road surface. Half a millimeter, or about 1/32" (0.030" +/-) would be right. Remember to scribe in control joints at regular intervals (every 3' to 4'); these are force the concrete to crack in the right places, so it doesn't look unsightly. A sidewalk might still crack, though, if the ground beneath it is disturbed somehow, such as by a tree root that lifts the walk out of the ground. Plus, portions of a walk might be re-cast when they are repaired, or when they are taken up in order to access a water main, and end up being a different color or texture. Be sure to include some details like these, for variety.
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