Case study that clearly explained the usefulness of the rail grinding when it is applied

• Operating body	Evaluation standard	Rail type	Before	Now
  Seoul Metro	accumulated passing tonnage (100milion ton)	60kg	6	Ballast : 10 / Concrete : 12
  		50kg	5	Ballast/Concrete : 8
  Australian Railway	Head Loss (%)	60kg	24%	one-side wear under 10mm : 40% one-side wear over 10mm : 34%
  		50kg	24%	one-side wear under 10mm : 45% one-side wear over 10mm : 32%

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