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voestalpine Railway Systems

  • NRG joint configurator
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NRG joint configurator

Go directly to the configurator

Configure your insulated rail joint!


We can create a custom electrical isolation weld for you. All applicable combinations used on the Dutch railway are available. The visual configurator displays the different options, allowing you to learn more about the possibilities of an NRG weld and customize it to your own needs. Need advice on which NRG weld is suitable for your situation? Contact us, and we’ll gladly walk you through the configurator step by step.

Choose your type of NRG-joint joint and Rail profile/steel combination

All possible combinations that may be used on the Dutch railway are available. Thanks to the configurator, the different options are made visible. This way, you can learn about the possibilities of an NRG-joint and customize it according to your preferences. Do you need advice on which NRG-joint should be applied in your situation? Feel free to contact us, and we'll guide you through the configurator at your own pace.

The following configuration options are available:

  • Type of insulated joint (ES joint) (4-hole or 6-hole)
  • Rail profile
  • Rail grade
  • Application in a turnout or plain line track
  • Depth-milled NRG insulated joint
  • NRG insulated joint with a radius
  • Rail coating
  • Positioning of rail contacts

Milled to the desired depth

Installing filler sections into existing track presents a unique challenge. New rail is taller than the worn, existing rail. It becomes even more complex when a new ES weld needs to be installed in existing track. Traditionally, this height difference is often addressed by raising the ballast bed under the track or by grinding — a time-consuming process. Additionally, this solution is frequently not the best choice for weld quality, as the joint between the weld and the existing rail is critical for both the quality and lifespan of the joint. Our answer to this challenge?

The NRG weld milled to depth

Because wear depth on the track varies, we can provide NRG welds milled to different depths, ranging from -2, -4, -6, to -8 mm. In our milling factory, the rail is accurately milled to the required depth. The advantage? There’s no need to raise the track on site. Additionally, less grinding is required on the track, which means lower heat input. Furthermore, transition welds become a thing of the past. All in all, this results in a significant improvement in quality and a considerable time saving during increasingly short track possessions.

Protective coating

In addition to the protective insulating coating that is applied to every NRG insulated joint as standard, our new coating line can also apply a coating to the rail on which the NRG insulated joint is installed. Coating contributes to a longer service life and improved reliability of rails. By applying the coating under controlled conditions prior to installation, we are able to deliver an optimal result.
Find out more about our protective coating

Installing prefabricated rail contacts

The purpose of a rail contact and the cable connection to the rail is to electrically connect a cable to the rail, a signaling object, or a power supply object. The rail contact forms part of the cable connection.

For track circuits, the rails and various railway signaling objects are electrically connected to each other by cables and associated cable connections. Furthermore, these cable connections are used in various power supply installations for cables that carry the return current of the traction power supply.

It is possible to also apply the rail contacts Prefab NRG joint in the Prefab NRG joint. The location of the rail contacts can be determined to the nearest mm using the configurator. ProRail's specifications for positioning the rail contacts are included in the configurator.


Advantages include

  • Saving time
  • No problems with weather conditions
  • Better quality
  • Location of rail contacts positioned to mm accuracy

Stel direct je eigen NRG-las samen

Application free track or turnout

It is possible to select in the configurator whether the NRG weld is applied in plain track or in a switch. The main difference is that Prefab ES welds for application in plain track must be milled (0.7 mm) in conformity with SPC00011-1. According to ProRail's specifications, this is not necessary for an ES weld in a switch, but this option can still be selected in the configurator if required. If an NRG weld is applied in a switch, it can be installed in a diverging direction. The configurator allows you to select the direction of the curve (left or right) and the appropriate radius.

Product Manager

Martijn van de Beek

martijn.vandebeek@voestalpine.com