Resilient pads on the underside of concrete sleepers

V-Fit UPS : under sleeper pads
V-Fit UPS : USP (Under Sleeper Pad)
V-Fit UPS : schema USP (PRA)

USPs, clear product benefits

Ballasted tracks have benefited from the development by rail engineers of the USP (Under Sleeper Pad) process, consisting of resilient pads placed on the underside of concrete sleepers.

illustration V FIT USP

The benefits of Under Sleeper Pads (USPs)

- Minimise the phenomenon of ballast attrition and hence reduce the ballast thickness (especially on the structure)
- Reduce vibrations, undulating faults and make the track less stiff
- Improve track geometry

Our V FIT USP solution

In order to fit these resilient pads to the underside of concrete sleepers, we are offering V FIT USP to manufacturers of concrete sleepers. This process involves casting or spraying polyurethane elastomer directly onto the prefabrication site.

V FIT USP is a synthetic polymer characterised by its excellent resilience and resistance to hydrolysis and abrasion. The installation method ensures a high level of efficiency and a quality of execution compatible with the performance of the industrial process for prefabricating sleepers.


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