7European Committee for Standardization. EN 13481 - 1 - 7 : 2002. Railway applications-track-performance requirements for fastening systems[ S]. Brussels:European Committee for Standardization ( CEN ) ,2002.
8European Committee for Standardization. EN13146- 4 : 2002. Railway applications-track-Test methods for fastening systems-Part 4 :Effect of repeated loading[ S ]. European Committee for Standar- dization(CEN) , Brussels,2002.
