If n is length of a rail in metres, the number of sleepers per rail length generally varies from

- 1
  
  $n t o (n + 2)$
- 2
  
  $(n + 2) t o (n + 4)$
- 3
  
  $(n + 3) t o (n + 6)$
- 4
  
  $(n + 4) t o (n + 5)$

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