ISO 22074-8:2022 pdf download – Railway infrastructure — Rail fastening systems — Part 8: Test method for vertical stiffness. 6 Test procedures for pads 6.1 Static test procedure for pads 6.1.1 Principle A force is applied normal to the test pad and the displacement is measured. 6.1.2 Apparatus 6.1.2.1 Controlled temperature test area, area of the laboratory where the test is conducted, maintained at (25 ± 5) °C. Where pads are to be used at other ambient temperatures, additional tests shall be performed in a temperature-controlled chamber, if required by the purchaser, at one or more of the following temperatures:...