Which of the following is/are the correct reason(s) to provide the gradient on the railway track? 1. To provide moderate rise or fall 2. To reach the various stations located at different elevators 3. To reduce the cost of earthwork Select the correct answer.
- A1 only
- B2 and 3 only
- C3 only
- D1, 2 and 3Correct
Solution
Concept
Purposes of gradients on railway tracks
Step-by-step solution
1. Gradients allow the line to rise and fall (1). 2. They enable the track to reach stations at different elevations (2). 3. They reduce earthwork by following the ground more closely (3).
Explanation
Gradients are provided to follow the natural ground, to reach points at different levels and to reduce the cost of earthwork.
Why the other options are wrong
Each of the other options omits one of the valid reasons.
Shortcut
Gradient: rise/fall, reach stations, save earthwork.
Common mistake
Choosing one reason only.
Correct answer: D) 1, 2 and 3