High elastic stiffness
Maintains confinement and structural response under repeated dynamic loading.
Reliable railway operation depends on a stable trackbed. Under repeated dynamic loading, small losses in support can develop into settlement, cross-level and surface defects, ballast fouling, speed restrictions and repeated maintenance.
Freight, high-speed passenger and urban rail systems place different demands on the track structure, but all require consistent performance from the ballast, sub-ballast, subgrade, drainage and embankment system.
For railway owners and operators, trackbed performance is directly connected to safety, service reliability, allowable speed, maintenance budgets and total cost of ownership.
Neoloy® Tough-Cells provide 3D mechanical soil stabilization within the ballast, sub-ballast or subgrade interface, according to the project design. The system confines the infill to form a stiff, semi-rigid reinforced mattress that spreads loads over a wider area and reduces stress reaching weak foundation soils.
By limiting lateral movement and vertical deformation, the reinforced layer helps maintain track support, reduce ballast attrition and slow the development of geometry defects. This makes Neoloy® Tough-Cells relevant to both new railway construction and the rehabilitation of high-maintenance track sections.
For railway projects, Neoloy® Tough-Cells can help:
Neoloy® Tough-Cells are manufactured from Novel Polymeric Alloy – NPA, with properties suited to repeated dynamic loading and long-term railway infrastructure:
Maintains confinement and structural response under repeated dynamic loading.
Supports long-term dimensional stability and limits loss of cell geometry.
Resists hoop stresses as vertical loads transfer through the confined layer.
Supports performance under water, UV, temperature extremes and demanding site conditions.
Provides stable support in areas with concentrated loading, frequent traffic, covered track or limited maintenance access.
Supports construction over difficult soils and rehabilitation of high-maintenance sections while reducing excavation, aggregate demand and operational disruption.
Supports erosion control, drainage channels, retaining structures, abutments and other earthworks along railway rights-of-way.
Up to 800% increase in reinforced-layer stiffness.
Up to 7x improvement, depending on soil conditions and project design.
Up to 65% reduction in cited railway testing; model embankment studies report reductions of 40–72%.
Up to 70% reduction in cited railway testing; model embankment studies report reductions of 50–67%.
Up to 50% reduction measured in a monitored high-speed railway projects.
Up to 50% reduction in sub-ballast thickness, subject to project-specific engineering validation.
Track surfacing cycles extended by a factor of 7 reducing maintenance.
Field testing delivered performance of 30% above the required planning threshold.
Support for loads up to 40% heavier and operating speeds up to 30% faster on the same infrastructure.
Reductions of 40% of earth work.
Monitored projects reported a 113% return on investment from reduced degradation and maintenance requirements.
Fewer surfacing and tamping cycles reduce possession requirements, train delays and recurring maintenance activity.
Up to 62% less high-quality aggregate required.
Up to 50% thinner structural sections over difficult soils, subject to validated design.
Reduce aggregate demand by up to 50% through reuse of suitable locally available material.
70% reduction on excavation and soil replacement, and in some designs eliminate capping layers while increasing trackbed stiffness.
Extend surfacing cycles by up to 7x, reducing repeated material use and maintenance mobilization.
The Eastern Line Railway required a stable foundation for a new passenger and freight line across extensive sections of weak, expansive clay. The track design had to support operating speeds of up to 160 km/h for passenger trains and 120 km/h for freight while controlling swelling, differential deformation and material use.
A hybrid solution combining dual layers of Neoloy® Tough-Cells with stiff biaxial geogrid was used to reinforce the sub-ballast. The system forms a high-modulus, semi-rigid platform that confines the granular layer, distributes loads and restrains the expansion potential of the clay subgrade.
Project value delivered
View Eastern Line Railway Stabilization Case Study
PRS supports railway owners, designers and contractors with project evaluation, trackbed optimization, material selection, value engineering, installation guidance and project-specific technical support for new lines and rehabilitation works.