Insulated Joints

Promoted via the Coronet brand, L.B. Foster Rail Technologies has become established as Europe's foremost manufacturer of glued and dry-mechanical insulated joint kits.

Glued Insulated Joint Kits

All of L.B. Foster Rail Technologies’ glued insulated joint kits are designed to take into account the local rail fastening methods employed in and around the intended installation site. The joint kit design is adapted to accommodate variable sleeper spacing and manages to always optimise the strength of the joint whatever the preferred fastening method.

Glued joint kits are available for workshop or site installation applications.

Manufactured in 4 or 6-hole designs to suit any rail section to our existing technical specifications or customer’s own requirements.

Site Glued Joint Kits

L.B. Foster Rail Technologies manufactures two types of site glued joint kit:

Coronet Site Glued Kit
A high strength, pre-insulated wedge fit design that is bonded to the rail using a rapid curing toughened epoxy resin systems. The resin is supplied in individual cartridges to suit the rail section and application involved. Site glued joint kits are typically bolted using high tensile threaded fasteners, however other fastening systems have been supplied to suit customers’ own requirements.

Thermabond Kit
A high strength, full web fit design which is supplied as a loose component kit that incorporates a pre-impregnated insulating liner. The liner bonds to the joint bar and rail after being activated by the application of heat post tensioning of the bolts.

Workshop Glued Joint Kits

Kits supplied for workshop applications are pre-assembled in PRG Sheffield’s workshops with a high strength insulating layer bonded to the web and fishing angle faces whilst the bolt-holes are also insulated using epoxy bushings providing superior compressive strength performance.

Workshop glued joint kits are manufactured in a wide variety of steel grades and insulating materials, all of which are chosen to suit the conditions of the intended track application. All workshop glued joint kits are based around a wedge fit design providing the optimum strength to the finished assembly.

Workshop kits are supplied with either multiple groove locking pins and collars or high tensile threaded fasteners based on an assessment of the customer’s requirements.

Kits are supplied to workshops for bonding to rail and can be supplied with rapid or slower curing toughened epoxy resin systems. The epoxy resin can be provided in either individual cartridges or bulk packaging complete with suitable metering equipment for accurate mixing and dispensing of the resin.

Dry Insulated Joint Kits

Coronet Joint

The innovative Coronet joint has been specially engineered to offer substantial benefits over existing dry-mechanical insulated joint systems.

It has a unique design that delivers the following benefits:

Delivers improved mechanical performance and electrical resistance, even after water immersion. Through better-engineered fit of components and a unique waveform to the web face of the fishplate.

Improved metallurgy of the steel core.

Manufactured by injection moulding around a precision machined steel core the Coronet Joint achieves tighter dimensional tolerance control than any other dry mechanical insulated joint on the market.

Designed for ease of use and rapid on-site assembly.

Optimum performance from dry-mechanical joints is achieved when they are installed as a system. This involves accurate cutting/drilling of rails, correct assembly and tightening of the fastenings, followed by periodic inspection of the bolt torque settings.

Much work has been done recently to improve the accuracy of the holes being drilled in rails, this work has focused both on hole diameter and positioning. This however is only of benefit if the insulated joint being used can replicate this improved accuracy.

In drilling trials where both new and worn rails were drilled to accept dry-mechanical joints, Coronet Joints were repeatedly installed without excess force being required to insert all 6 bolts (of the correct diameter)

Available in 4 or 6-hole options to suit CEN56 E1 & CEN60 E2 rail profiles.

Manufactured and tested to the exacting requirements of the Network Rail specification, the Coronet joint has met all the criteria as set out in RT/CE/S/023.

Cyply Dry Insulated Joint

A single unit manufactured from composite epoxy glass cross-weave with a unidirectional configuration. This lightweight yet remarkably strong fishplate unit provides a fail-safe design solution with regards to electrical insulation.

The performance characteristics compare favourably with steel based joints in tensile and shear values. The range is available in many rail sections and is particularly favoured in light rail applications. Due to its lightweight construction ease of maintenance.


  • Complete system including fasteners
  • Reduced installation time
  • High insulation properties
  • Extensive fatigue testing conducted
  • Fully retractable from rails for access/maintenance

Component Data
Comply is a solvent free, epoxy glass crossply weave with a unidirectional configuration. High mechanical properties result in excellent installed strength to both the fishplates and end post. High tensile fasteners with locking nuts are employed in the design along with load spreading steel washer plates.

Burns Nylon Insulated Fishplate Kits

L.B. Foster Rail Technologies is the manufacturer of the Burns Joint kit, also known as “Burns Treble 6.”

Burns kits are available to suit UK rail sections 113A, 98lb and 95RBH.

We can supply new complete kits for first time installations or maintenance insulation kits for in situ repair to failed joints.

Our Purpose

Improve the design and supply of products and services required to enhance the performance of rail networks