Sustainable heavy haul fastening technology

Introduction

Railways worldwide are facing dual pressures: achieving “net zero” by 2050 while maintaining performance and safety in heavy haul operations.
Here, Pandrol’s Alejandro Giner, explains how the SD fastening system meets these demands, by delivering exceptional technical performance with significantly reduced environmental impact.

“The design of Pandrol’s SD (Safe Driven) fastening system prioritised significant environmental impact reduction, resulting in a more streamlined, lighter and cost-effective solution compared to alternative systems. The SD system comes pre-assembled on the sleeper or slab component, offering guided clip movement from parked to operational position whilst enabling swift mechanical installation. The system utilises a screw and insert mechanism for tensioning the SD clip, generating sufficient axial force to compress the clip and ensure proper rail foot clamping.

SD: A versatile system for all applications

The SD system’s versatility enables its use across various railway types, from heavy freight operations to urban transit systems. Notable implementations include Mexico’s Heavy Haul lines and France’s Grand Paris Express driverless metro system, whilst also serving as a modern replacement for traditional screwed fastening systems across multiple different projects. The SD system presents a myriad of benefits over conventional screwed mechanisms.

Engineered for heavy haul performance

The SD fastenings offer significant advantages over traditional fastening systems, combining enhanced protection and robustness with efficient installation and low carbon footprint. Its configuration prevents dust ingress and ballast interference, ensuring sleeper protection and long-term performance, while the guided clip geometry and compatibility with mechanised installation deliver exceptional productivity during installation.

Rail fastener durability

The system’s reduced weight does not compromise its robustness or durability. The SD range is engineered to withstand high-frequency vibrations typical of railway operations, minimising fastening system deterioration and ensuring track safety.

The SD clip’s innovative design with its unique guidance enables a swift transition from parked to operational position through a simple screw adjustment. When combined with pre-assembly and mechanised installation options, this feature facilitates rapid track construction and maintenance operations. The result is considerable reduction in labour expenses, alongside decreased distribution and handling costs throughout the system’s operational life.

Proven heavy haul applications

Pandrol’s SD systems are deployed across global heavy haul environments, demonstrating reliability across varying axle loads, climates, and operating speeds. They successfully replace traditional screwed fastenings while improving performance and sustainability outcomes.

As networks pursue net zero targets, every component decision matters. SD demonstrates that sustainability and performance can work together – combining engineered resilience with reduced manufacturing, transport, installation and maintenance impact. For heavy haul operators, it offers a proven route to meet environmental and operational targets simultaneously.”