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技规第26条4款规定:“道岔在尖轨头部上面宽50毫米及其以上的断面处,尖轨较基本轨低至2毫米及其以上时,在线路上禁止使用。这项规定是保证机车车辆顺向通过转辙器时,避免基本轨受轮对横向挤压后发生倾倒,造成脱轨事故。为此,在可能发生横向挤压基本轨的危险区域内,尖轨轨顶不得低于基本轨轨顶 2毫米,以确保运行安全, 危险区域的终端(按尖轨轨头宽计),应根据某种具有极限磨耗的轮缘厚hmin,
Article 26, paragraph 4, of the Technical Regulations stipulates: "Turnouts are not allowed on the route when the sharp rails are at a cross-section 50 mm or more above the head of the sharp rail, as low as 2 mm or more from the base rail To ensure that locomotives pass through the switch in the forward direction, avoiding the dumping of the basic rails after transverse crushing, resulting in the accident of derailment.Therefore, in the dangerous area where lateral crushing of the basic rails may occur, the top of the sharp rail rails shall not be low At the top of the basic rail 2 mm, to ensure safe operation, the danger zone of the terminal (according to the rail head rail width gauge), should be based on a flange with the ultimate wear thickness hmin,