If G is gauge is metres, V is speed of trains in km/hour and R is radius of a curve in metres, the equilibrium super-elevation is

- 1
  
  $\frac{G V^{2}}{R}$
- 2
  
  $\frac{G V^{2}}{17 R}$
- 3
  
  $\frac{G V^{2}}{127 R}$
- 4
  
  $\frac{G V^{2}}{227 R}$

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