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If a broad gauge track is laid with wooden sleepers with a density of M + 7, spacing of sleeper is 68 cm and the width of the sleeper is 25.4 cm, then the depth of the ballast cushion would be:


1. 22.5 cm
2. 21.3 cm
3.  24.0 cm
4. 23.0 cm

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Best answer
Correct Answer - Option 2 : 21.3 cm

Concept:

Relationship between sleeper spacing, width of sleeper, and depth of ballast cushion is given by the following formula:

Sleeper Spacing = Width of Sleeper + (2 × Depth of Ballast Cushion)

Calculation:

Given Data:

Let D = depth of ballast cushion

Sleeper Spacing = 68 cm

Width of sleeper = 25.4 cm

Putting these data in above equation, we get,

68 = 25.4 + (2 × D)

So,

Depth of Ballast Cushion, \(D = \frac{{68 - 25.4}}{2} = 21.3\;cm\)

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