In a B.G. railway track, the specified ruling gradient is 1 in 250. The horizontal curve of 3° on a gradient of 1 in 250 will have the permissible gradient of
A)1 in 257
B)1 in 357
C)1 in 457
D)1 in 512

Question

Quizplus · Accepted Answer

The permissible gradient on a curve is calculated by adding the ruling gradient to the curve resistance. For a 3° curve, the curve resistance is approximately 30 meters per degree of curve. Therefore, the effective gradient becomes 1 in (250 + 30*3) = 1 in 340, which is approximately 1 in 357.

In a BG Railway Track, the Specified Ruling Gradient Is 1 in 1