scope:

The methodology provided in this document applies to rolling stock manufacturers who are providing the EMC safety case with 50 Hz double rail track circuits as part of the acceptance process.

The methodology is split into two distinct parts - one that considers the effect of steady state electromagnetic interference (EMI), and the other which considers the effect of transient EMI. The methodology predicates the use of the fully validated model of the double rail 50 Hz track circuit possessed by Network Rail which can be provided to persons presenting such a safety case albeit an alternative approach is also presented.

Purpose

The purpose of this document is to provide a methodology for the demonstration of electromagnetic compatibility (EMC) of rolling stock with 50 Hz double rail track circuits installed on Network Rail controlled infrastructure. It is based upon previously accepted safety assessments, which were undertaken for traction and rolling stock thereby allowing them to operate over 50 Hz double rail track circuits.