The project was developped for the Grand Paris
Express, according to Techincal Specifications
PN1210_06_ ACT_STE_002207
TBE-N1, low vibration attenuation
design natural frequency 42 Hz
TBE-N2, intermediate vibration attenuation
design natural frequency 29 Hz
TBE-N3, in heavy concrete, high vibration attenuation
design natural frequency 24 Hz