Study the following statements regarding creep. i) Creep is greater on curves than on tangent railway track ii) Creep in new rails is more than that in old rails iii) Creep is more on steep gradients than on level track The correct answer is A. Only (i) B. (i) and (ii) C. (ii) and (iii) D. (i), (ii) and (iii)

The correct answer is D. (i), (ii) and (iii).

Creep is a slow, permanent deformation of a material under stress. It is a common phenomenon in railway tracks, where it can lead to buckling, derailment, and other problems.

The amount of creep that occurs in a railway track depends on a number of factors, including the type of rail, the temperature, the loading, and the curvature of the track.

In general, creep is greater on curves than on tangent track. This is because the rails on a curve are under a greater bending stress, which causes them to deform more.

Creep is also greater in new rails than in old rails. This is because new rails are not yet fully consolidated, and they are therefore more susceptible to deformation.

Finally, creep is greater on steep gradients than on level track. This is because the rails on a steep gradient are under a greater tensile stress, which causes them to deform more.

Therefore, all three statements are correct.