Points of View Categories Applications Catalogues

Rail web Permanent Electrical Contact

for hole diameter 19-20 mm

This unique system was designed and developed by Cembre in 1988 following a review of existing electrical connection systems.

The aim of the Cembre system is to provide a low resistance interface between the rail web and the terminal lug.

Following in-depth testing in the laboratory and extensive fi eld trials, the system has been recognised and approved for total reliability.

  • low electrical resistance (microhm)
  • simple to install, not dependent on operator skill level
  • quick and easy to install (less than one minute)
  • easy to connect/disconnect cables, for fault finding


The advantages of using the rail web contact, AR60D are that the bush can be installed in all weather and environmental conditions, with a simple easy to operate, portable tool, producing a consistent, quality installation, independent of the skill of the operator. The reduced installation time of this systems results in overall cost savings.


During installation the bush is ‘extruded’ and the copper material flows into the wall of the hole, compensating for variation in hole size and filling any voids and uneven surfaces.


Schematic view of the extrusion process (section):



Extensive testing, performed in the test laboratory and in the field, has demonstrated a low and constant resistance, mechanical stability and protection from atmospheric corrosion.


Examples of the electrical tests:


Heat Cycling Tests

Short Circuit Testing

On site Testing


Examples of tests in salt water environments:

Salt Mist Exposure Testing




Transmission of coded and return current
lines fitted with automatic block


Signalling and traction current connection to manganese steel cast exchange units


Connection of metal structures to rails
for earthing purpose

Electrical connection of underground metal structures to rails

Various connections involved
in the train location 

Return current connections to substations


Examples of lines equipped with automatic block:


Examples of AR60D system in electrical joint applications:


Features and benefifi ts of the AR 60D system have appeared in various Railway Industry journals


Used by all major European Railway Companies,
the AR60D system is proving to be reliable in all conditions.

Technical characteristics Other characteristics

Ø Stud mm 19 mm
Patented yes
Minimum thickness of the rail 14 mm
Maximum thickness of the rail 16.5 mm

Media gallery other media

Rail web Permanent Electrical Contact AR60D

notes and legal information

Cembre Via Serenissima, 9 - 25135 Brescia - ITALY
© Copyright 2018 Cembre S.p.A.

CODICE FISCALE – P.IVA: 00541390175
CAPITALE SOCIALE: € 8.840.000 i.v.