What is BS EN 13146‑4 about ?  
BS EN 13146‑4 is the fourth part in the multi-series of documents that discusses test methods for fastening systems.
BS EN 13146‑4 specifies a laboratory test procedure for applying repeated displacement cycles representative of the displacements caused by traffic on the railway track. It is used for assessing the long-term performance of fastening systems.
The procedure is applicable to surface-mounted rail on sleepers, bearers and slab track, and embedded rail. This test procedure applies to a complete fastening assembly.
Who is BS EN 13146‑4 for ? 
BS EN 13146‑4 on the test methods for fastening systems relevant to: 
- Designer and producers of rail fastening systems
- Railway management authorities 
- Infrastructure managers
- Site supervisors 
- Inspection and testing department in railways  
- Train operator companies (TOCs) 
Why should you use BS EN 13146‑4 ?  
The main function of rail fastening systems is to fix rails to railway sleeper or railroad ties. Fastening systems generally consist of rail anchors, rail tie plates, chairs, fasteners, spikes, screws, bolts, etc.
Under BS EN 13146-4, a constant amplitude, cyclic force is applied by a single actuator at a predetermined load line and position on the rail head. The load, position and line of application to be used are determined from the vertical stiffness of the fastening assembly, axle loads and curve conditions of the track for which the fastening assembly is being tested.
Performance is determined by the change in clamping force, longitudinal rail restraint, vertical stiffness and rail position, and visual inspection of the components during test.
Overall, compliance to the test method suggested by BS EN 13146-4 can help you evaluate the dynamic fatigue strength and holding forces that ensure operational safety of railway networks, while protecting the rail against tilting. If you are a manufacturer of fastening systems, BS EN 13146-4 can ensure your products are safe and reliable.
