For train wheel force measurement and rail way track monitoring Caesar released the second generation high speed train wheel force transducers with up to 32 strain gauge sensors built-in. With the new generation the transducer is mounted outside the wheel and is tested already over 50,000 km without any issues. During many Km the train did go over 380km/h. The unit is designed and tested for speeds over 500Km/h.
Caesar VRT32: Rail Track Analysis