The RailMeasurement bi-CAT is an instrument for measuring corrugation and acoustic roughness on two rails simultaneously. It can be easily transported to site, assembled and used by one person. The equipment measures to the accuracy required by the European Standard for reprofiling rail (EN13231-3:2012) as well as the European Standard for roughness measurement (EN ISO15610:2009).
In reality the bi-CAT does much more than this, as the equipment gives records to a precision of 0.01 microns that can be as long as the operator is confident of measuring. The data files are about 2MB/km, so a 1GB hard drive could contain a record for 500km of track. That record can be used to provide spectra to wavelengths of several metres, although we would not recommend its use for much more than 3m wavelength. There is good evidence that the RailMeasurement RCA is a more reliable instrument to measure wavelengths of several metres wavelength.
The bi-CAT can be and has been used to undertake corrugation surveys of complete railway systems. The software that comes with the equipment has built-in functions to display areas that require reprofiling.

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