The raising of outer rail over inner rail is called
- ACant deficiency
- BCantCorrect
- CCapacity of the track
- DCentre bound sleepers
Solution
Concept
Cant is the amount by which the outer rail is raised above the inner rail on a curve.
Formula
e = G V2 / (127 R)
Step-by-step solution
1. On a curve, the outer rail is raised above the inner rail. 2. This raise balances the centrifugal force on the train. 3. This raise is called cant (superelevation). 4. So the answer is option B.
Explanation
On railway curves the outer rail is kept higher than the inner rail. This difference in level is called cant or superelevation. It helps the train move safely and comfortably on the curve.
Why the other options are wrong
A: Cant deficiency is the shortfall between the cant needed for the maximum speed and the actual cant provided. C: Capacity of track is the number of trains the track can carry in a given time. D: Centre bound sleepers are sleepers packed hard at the centre, which can make them rock or crack.
Shortcut
Raise of outer rail = Cant = Superelevation.
Common mistake
Confusing cant with cant deficiency.
Correct answer: B) Cant