They initially used different brakes, but they reverted to the good old peanut oil brakes because they had issues of some sort with dust. I'm struggling to fin

They initially used different brakes, but they reverted to the good old peanut oil brakes because they had issues of some sort with dust. I'm struggling to find a source that tells the reason, but here you can see they chose wooden brakes. https://www.stm.info/sites/all/modules/custom/stm_import/imported_files/a-%20FicheMPM-10maquette_12.pdf https://www.stm.info/sites/all/modules/custom/stm_import/imp...