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eng.rail-vertical-curve-K Calculator
Calculates railway vertical curve parameters including K-value, tangent grades, and curve length from speed and grade standards. Railway vertical curves are parabolic — K-value (length per percentage of grade change) determines the sharpness and is set by speed and sight distance requirements.
Inputs
G1 Pct
Reference formula or conversion factor shown for context.
G2 Pct
Reference formula or conversion factor shown for context.
Design Speed Km H
Rate of movement. 1 m/s = 3.6 km/h = 2.237 mph.
Curve Type
Reference formula or conversion factor shown for context.
Results
K value (m per % change)
The computed numeric or monetary value.
minimum curve length L (m)
The smallest value in the dataset or feasible range.
algebraic grade change A (%)
Letter or numerical grade indicating quality, creditworthiness, or performance on a defined scale.
minimum radius of curvature R (m)
The smallest value in the dataset or feasible range.
K = V² / (385 for sag | 960 for crest)
Reference formula or conversion factor shown for context.
curve type
The classification or type assigned based on the inputs.