1 Scope
This Technical Specification defines, for the purpose of ensuring compatibility between
rolling stock and axle counters, the electromagnetic interference limits for rolling
stock and the measurement and evaluation methods to verify rolling stock emissions
and demonstrate compatibility with the interference limits.
Compliance with the limits for rolling stock is necessary for a reliable and safe
operation of the railway.
The interference limits have been defined for application to interoperable rolling
stock. They are for a set of preferred types of axle counters which are defined by
Railway Infrastructure Managers for use on new signalling projects on interoperable
lines. If the interoperable line over which the rolling stock is intended to run is
equipped with an older version or non-listed axle counters then National Notified
Technical Rules apply. It is not the intention of this Technical Specification to
mandate any particular type of train detection but it is expected that because the
list of selected types and their limits for compatibility are drawn on the basis of
established performance criteria, the trend will be that newly signalled interoperable
lines are fitted with types which meet the compatibility limits published in the Technical
Specification and measured in accordance with the test specification in Annex C.
To ensure an adequate operational availability, a margin of 9 dB between the measured
axle counter limit and the limit for rolling stock has been applied. If rolling stock
does not comply with the defined limits, the availability of the axle counters may
be reduced. The measurement condition for railway vehicles with voltage DC-link are
provided as an example.
NOTE 1 The influence from metal parts or inductively coupled resonant circuits on the vehicle, eddy current brakes or magnetic brakes is out of the scope of the Technical Specification. Compatibility is established through individual testing according to EN 50238‑1 or National Notified Technical Rules.
NOTE 2 Wheel sensors and crossing loops are not part of this Technical Specification.
As the electromagnetic interference coupling between rolling stock and axle counters
is multidimensional and difficult to handle, a proposal is made in this Technical
Specification for frequency management with fixed frequency ranges (and limits) in
Annex B informative, to allow for future developments of rolling stock and axle counters
with the aim to decrease the development risk and to minimize the homologation effort
for both, rolling stock and axle counters.