If w is width of sleepers, 8 is sleeper spacing and d is depth of ballast then

- 1
  
  $d = \frac{8 - w}{2}$
- 2
  
  $d = \frac{8 - w}{3}$
- 3
  
  $d = \frac{8 - w}{4}$
- 4
  
  $d = \frac{8 - w}{5}$

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