Failure Modes Effects and Criticality Analysis of Switch Rails and Crossings Toward Maintenance Improvement: A Case Study of Addis Ababa Light Rail Transit

Since their geometrical structure is different to the ordinary line track, crossings are sensitive to failure and can be damaged easily by the train wheel. In this research paper, the existing failures of switches and crossings have been discussed. The aim of this study is improving the maintenance trend of standard switch rails and crossings by analyzing the existing failures and their effects. To conduct this study the failure mode and effects and criticality analysis (FMECA) method has been employed with appropriate techniques. The failure mode, effects and criticality analysis (FMECA) model helps to understand the most critical failures by categorizing based on their risk priority number. From the results of the analysis six failure modes have been laid under high risk categories whereas two failure modes have been laid under moderate risk categories and four failure modes have been laid under low risk categories. In the end it is possible to conclude that the failure modes under high risk category need special attention during maintenance planning and need improvement in the previous rectification techniques.