If L is length of a rail and R is the radius of a curve, the versine h for the curve, is

- 1
  
  $a = \frac{L}{4 R}$
- 2
  
  $a = \frac{L^{2}}{4 R}$
- 3
  
  $h = \frac{L^{2}}{8 R}$
- 4
  
  $h = \frac{L^{2}}{16 R}$

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