This is called the minimum radius curve, a technical term for railways. It is a common technical standard on railways, and it is also called' turning radius' in non-professional occasions, and its meaning is equivalent to geometric curve radius. The reciprocal of this number can reflect the degree of curvature of the curve, that is, curvature. When this parameter is mentioned on the railway, it generally refers to the curve on the horizontal plane. For the case that the vertical projection is a straight line but the railway is actually above the ramp, the slope is used to measure it. Please refer to the maximum longitudinal slope.

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