Thank you for quick reply, EBlach. I do understand now about the offset of the profile. It seems that we have to take a look from top of the rail For example UIC 60 has: left_rail_base left_rail_head right_rail_head right_rail_base -0.111 -0.072 0.000 0.039 The left rail base are ((150 - 72)/2)+72= 111 mm, rail head has 72 mm width, the same with left_rail_head -0.072 etc So, for grooved rail 59R2 or Ri59N based on EN14811 are left_rail_base left_rail_head right_rail_head right_rail_base -0.105080 -0.055830 0.057170 0.07492 Am I correct?
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