The Institute for Standardization of Bosnia and Herzegovina, through its Technical Committee BAS/TC 46, Railways, adopted the third edition of the technical specification BAS CLC/TS 50238-3: 2021, Railway applications - Compatibility between rolling stock vehicles and train detection systems - Part 3: Compatibility with axle counters, which is a translation of the English version of the European technical specification CLC/TS 50238-3: 2019, Railway applications - Compatibility between rolling stock and train detection systems - Part 3: Compatibility with axle counters.

Technical specification BAS CLC TS 50238-3: 2021 defines interference limits and evaluation criteria for electromagnetic compatibility between rolling stock and axle counter detectors.

This document defines:

 set of interference limits for magnetic fields resulting from rail current and equipment on board the vehicles;

 evaluation criteria to verify rolling stock emissions and demonstrate compatibility with the interference limits for magnetic fields;

 traceability of requirements (type of axle counter detectors considered for the limits).

In the relevant frequency range of the axle counter detectors, the magnetic field is dominant and only this type of field is considered. Experience has shown that the effects of electric fields are insignificant and therefore not considered.

For the purpose of demonstrating compatibility between rolling stock and axle counter detectors, this document defines the interference limits and evaluation methods to verify rolling stock emissions. Wheel sensors and crossing loops are not covered by this document.

This document gives recommended individual limits to be applied to establish compatibility between RST (rolling stock-train) and all selected types of axle counter detectors, including any covered by national standards.

The list of selected types of axle counter and their limits for compatibility are drawn on the basis of established performance criteria. It is expected that the trend for newly signalled interoperable lines will be fitted with types that meet the compatibility limits published in the TSI CCS Interfaces Document (ERA/ERTMS/033281).

To ensure adequate operational availability, it is essential that the rolling stock complies with the defined limits; otherwise, the established availability of the valid output function of axle counter detectors may be compromised.

The original text of the European technical specification was prepared by the CLC/SC 9XA, Communication, signalling and processing systems, of Technical Committee CLC/TC 9X, Electrical and electronic applications for railways, the secretariat of which is held by the French National organization for standardization (AFNOR - CEF).