Strong stray current isolation performance Corkelast® ERS Canberra

Formally reported measurements to the Stray Current Working Group, show the Canberra embedded rail system continues to prove an excellent seasonal trend.

Rail-to-earth resistance results in the wet surpass 20, while dry conditions show phenomenal readings in the order of 60 to 80

edilon)(sedra Australia supplied the Corkelast® Embedded Rail System (ERS). The ERS track covers 12 kilometres of double track in total and a depot.

The Canberra Light Rail project provides convenient access to the city centre and northern suburbs for residents and commuters. Travellers can use a durable rail connection for many years to come, thanks in part to the proven excellent electrical insulation characteristics of Corkelast® ERS!

In order to explain the theme of stray current isolation, we have made this short animation video (click on the image to start the video).


Newly built Odense Tramway line completed: Danish ‘green dream’ becomes reality

After an intensive period of preparations and installations, the newly built Odense Tramway line is completed. The first test drives have been successfully carried out. We are proud of being part of this project, complying to the latest environmental standards!

The intended purpose of the 14,5 km new double-track light rail transit is to reduce the number of car trips in the growing city, as well as noise pollution and carbon emissions, while reducing lifecycle costs.

We are pleased with the great teamwork before and during the installation of these green tracks. Our well-known edilon)(sedra SDS (Sound Damping System) has been applied in combination with the innovate rail insulation system, edilon)(sedra Editack Spray. This is a unique PU based rail coating system which ensures an optimal degree of stray current insulation. Editack Spray is easy to install even under harsh climatological conditions and can be durably applied on any type of rail, in compliance with all technical standards.

The opening of the new line is planned for the end of 2021. From then on, the dreamed-of tramway is expected to serve 35.000 passengers every weekday, connecting the important administrative facilities, the University of Southern Denmark and shopping areas.

Odense green track

edilon)(sedra Editack Spray – a unique insulation system for all kinds of tramway & LRT tracks






Extension to Vitoria-Gasteiz tram network – It doesn’t get any greener!

edilon)(sedra has been awarded the contract to supply track systems for the 5 km extension of the Vitoria-Gasteiz tramway for contractor UTE Tecsa Altuna and end-customer Euskal Trenbide Sarea. Vitoria-Gasteiz is one of the most environmental orientated cities in Spain.

Investments in green development to improve infrastructure, are supported by both the local government and city council. Low noise and vibrations combined with an outstanding electrical isolation are some of the key requirements for the track.

Our track systems Corkelast® EBS and SDS provide answers to these requirements and will be installed accordingly. Our rail coating solution Editack, will be supplied for rail isolation and our Trackelast® noise & vibration mats for sensitive areas. Product deliveries will start from Spring 2021. Our application engineering team supports with the design works, preparation of switches and installation supervision.

The 5 km extension includes five new platform stops that are identical in structure, size and shape. They will be located in Santa Lucía, La Iliada, Nicosia, La Unión and Salburua. From 2008, we arranged a broad spectrum of rail fastening systems and technical consultation services for the Vitoria- Gasteiz tramway in Spain, including ‘in street’, station, grass and depot tracks (16,5 km in total). The tramlines are perfectly integrated in the urban landscape and offer a vital contribution to the city’s high ambitions in the field of sustainability.


The importance of electrically insulated tracks

A high electrical insulation of the track infrastructure is an important aspect, especially for urban transport modes, such as for light rail and metros. If the railway system is not adequately insulated from the ground, this can lead to damaged tracks and pipes laid underground. Stray currents can cause considerable corrosive damages to the rails, fastening systems and installed track reinforcement. In addition malfunctions in train control and signalling systems are possible effects. Stray currents also lead to the risk of damaging surrounding rusted metallic components that are not part of the railway, such as gas pipes.

The standard EN 50122-2 specifies requirements for protective measures against the effects of stray currents caused by the operation of an electrically powered railway. The following aspects have a significant influence on electrical insulation and should be considered during the track design phase: distance of the substations, return line connections, insulation of the rails from earth and additional measures to improve them.

Often control and signalling technologies, such as train detectors, are in use on the infrastructure to detect and position vehicles, in order to secure the track. The use of such circuits results in specific insulation requirements for the track system. In order to ensure reliable train operation, construction measures must provide defined electrical and magnetic characteristics for track sections in which track circuits are to be installed.

In some cases, the planned slab track is designed with a reinforced in-situ concrete layer. The diameter of the reinforcement also has an influence on the control and signalling systems. Steel reinforcement in the track and track system, such as tie bars or lattice truss girders, dampens the electrical field. If an electrical conductor comes into the oscillating electrical field generated by induction, the frequency will change. For this reason, it is important to ensure a proper electrical insulation of the track system.

In general, a track system is ideally suited if it guarantees a high level of insulation, including a sufficiently large safety buffer to compensate for the difference between laboratory tests and the real condition on the track site.

EBS as safety buffer
The Corkelast® EBS-RF and EBS-UF track systems (EBS) are designed to match these high requirements. The key component of both systems is a prefabricated tray which consists of Geotextile and the Corkelast® elastomer. This material combination ensures a very high electrical insulation. The tray is working as an insulating intermediate layer and will disconnect fastening systems from the track as well as both running rails.

EBS: rail-to-rail and rail-to-earth insulation





EBA approval solid structure bridges

We are delighted to announce that The German Federal Railway Authority (EBA) granted edilon)(sedra GmbH Munich approval for the ERS-HR rail fastening on solid bridges.

This continuously elastic rail fastening system, which has been successful throughout Europe for over 40 years, is now also available in Germany up to a maximum speed of 160 km/h.

Reduction of construction height
The main field of application are short (semi-)framed structures up to approx. 25 m length with minimum construction height and demanding acoustic requirements. For this purpose, steel troughs will be integrated into the concrete slab, thus achieving a reduction in construction height of up to 70 cm. The embedding of the rails in a continuously supported elastic polymer is optimal in reducing acoustical emissions and thus is capable of reducing secondary noise emissions.

This was preceded by almost 10 years of operational testing on regional lines as well as on lines of the long-distance and conurbation network.

Technical support
The ERS fastening system is based on the Corkelast® LCS level crossing technology, which has already been successfully used for over 20 years in the network of Deutsche Bahn.

For more information please consult our technical ERS-HR bridge specialists. They are eager to answer your questions and offer you technical support!