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The question is, how to measure the gradient of a curve.The answer is pretty straightforward.  I assume you already know how to measure the gradient of straight track based on calculating rise / run, using your stepping block and level.  So go ahead and calculate the rise by that method, from the beginning of the spot on the curve you want to measure to the end.Now, divide that number by the total distance around the curve.  You can calculate this in one of two ways (as well as a number of more complicated ways):1.  If you're using preformed curved track sections of a known radius: multiply the radius by 6.3 (2pi) to get the diameter of the circle.  Divide by the number of segments needed to make a circle (usually 12 or 16).  That's the length of each curved track segment.  For example, 10' diameter (5' radius) track has a diameter of approximately 31.5.  Aristo-Craft 5' radius track comes 12 segments to a circle.  Therefore each segment is approximately 31.5 inches (31.5 feet / 12 = 31.5 inches) long.2. If not, get a piece of string.  Fasten one side to a sleeper where you want to start measuring, and stretch it along the curved side of one of the rails until you reach the end.  Mark the end, stretch the string out straight and measure it.  (You can also do something similar with a soft measuring tape instead if you prefer).  If that's still not precise enough for you, measure each rail and take an average between them to get the distance measured down the center of the track.You now have the vertical distance and the horizontal distance.  Divide one by the other and you have your gradient.
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