Mechanism of Derailment at the Guardrail Position of Turnout and a Reasonable Guardrail Interval Limit

Recently, derailments have been occurring frequently at the guardrail position of double-slip turnouts. In order to provide a theoretical basis for effectively avoiding derailment turnouts, this study presented mechanism, discussed rationality current interval limit and its calculation method, proposed method calculating based on vehicle running attitude wheelset angle attack. Based established model, paper calculated main types single turnouts in China, studied factors influencing corresponding patterns. The following conclusions were drawn. (1) actual maintenance, it suggested set 1365 mm, which can meet requirements most avoid wear incurred by vehicle–track interactions opening section guardrails derailment. (2) For required becomes smaller with decrease frog number, radius lead curve, increase gage width. Further, decreases when endpoints curve widening become closer buffer segment toe end guardrail. Adopting straight-track design restoring is more likely cause larger twisting bogie than curved-track design, means requiring limit. (3) reduced number broken rail comprising switch stock front also enable approach or reach inscribing state, resulting negative impact not that produced curved rail. attack tip guardrail,