2024 49 CFR 213.359 – Track stiffness

2023 49 CFR 213.359 – Track stiffness

2022 49 CFR 213.359 – Track stiffness

2021 49 CFR 213.359 – Track stiffness

2020 49 CFR 213.359 – Track stiffness

2019 49 CFR 213.359 – Track stiffness

2016 49 CFR 213.359 – Track stiffness

2015 49 CFR 213.359 – Track stiffness

2014 49 CFR 213.359 – Track stiffness

2010 49 CFR 213.359 – Track stiffness

2009 49 CFR 213.359 – Track stiffness