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Standards Development
This document specifies the laboratory test procedure to determine the moment necessary to rotate a rail, secured to a sleeper or other rail support by a rail fastening system, in a plane parallel to the base of the rail. The value obtained can be used in track stability calculations.
This test procedure applies to a complete fastening assembly. It is not applicable to fastening systems for embedded rail.
The test method evaluates the influence of torsional loading on rail fastening systems. The test method quantifies the resistance in terms of load versus rotation (or their maximum values) when the rail rotates in the rail seat. The resistance is a key variable for the track panel stability in particular in ballasted tracks. With ongoing climate change and increase of extreme temperatures, the track panel stability is gaining importance in the assessment of track safety.
Therefore, sharing the technical information of this method is internationally beneficial as the test method enables a comparison of different rail fastening systems used in the same condition, and provides a solution for the evaluation of rail fastening systems. Moreover, it matches the philosophy of international standardisation.
From these points of view, it is proposed to develop the document of this test method as a new part of the existing parts for test methods of rail fastening systems.
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