Bi-CAT (Corrugation Analysis Trolley for two rails)
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What is bi-CAT
bi-CAT on track ready for operation
RailMeasurement developed the bi-CAT so that a single user can measure two rails simultaneously with the same accuracy as the CAT. The equipment can also be transported to site and assembled by a single person. The bi-CAT uses the same technology as the CAT and essentially the same software to measure rail corrugation and acoustic roughness on one rail at a comfortable walking speed of 3-4km/h (1m/s). The bi-CAT packs into the same size of plastic instrument case as a CAT, but has an additional plastic box that contains the framework. The total weight of the equipment and carrying cases is less than 25kg.
The bi-CAT can be used on flat-bottomed (Vignole), embedded or grooved rails.
The main use of the bi-CAT is for corrugation surveys and quality assurance of rail reprofiling work, particularly for those clients who have to collect measurements in a short time window. The equipment was indeed developed at the request of these users.
The Review software for the bi-CAT is specifically designed to help the user decide how to use the measurements to plan rail reprofiling and to show where reprofiling is still required. For example, the following Figure, taken directly from Review of several concatenated files covering more than 7km of a light rail line, shows that about 1.55km of 7.18km should be reprofiled according to prescribed criteria, or about 21% of the line.
Reference can be made to what is written about the CAT to see other potential uses of the bi-CAT.