RailMeasurement Ltd (RML) was established by Dr Stuart Grassie and the late Dr Martin Saxon, who worked jointly in the area of corrugation measurement for more than 25 years. Dr Saxon died in 2016. Our intention was to enjoy what we do, to be good at it and indeed try to be the very best.
RML’s speciality is the production of robust and reliable equipment for the accurate measurement of rail corrugation and acoustic roughness. The same equipment is used by clients for routine measurement of reprofiling work and by acousticians who undertake research on wheel/rail noise. Our best known and most widely used product is probably the CAT (Corrugation Analysis Trolley), the first example of which appeared in 1997.
We also make equipment to measure circumferential irregularities on wheels, which was originally developed for and supplied to a major vehicle manufacturer.
Dr Grassie and Dr Saxon’s first joint product used axlebox accelerometers and digital signal processing to measure corrugation and bad welds for Australian National railways (AN). This equipment was used to schedule grinding and straightening of welds. It was based on principles, expounded in Dr Grassie’s PhD research, and first exploited by British Rail Research. The AN system was probably the first validated digital implementation of an axlebox accelerometer system to measure rail corrugation. It formed the basis of RailMeasurement’s HSRCA (High Speed Rail Corrugation Analyser).
We are keenly aware of our responsibility to support our clients with equipment of the highest standard in accuracy, reliability, ease of use and independent verification.
All of our products have been the subject of thorough validation not only by ourselves but also, wherever possible, independently by experts working in the area. We have published our results openly at conferences and in the peer-reviewed literature. Many of our papers and presentations are available from this website. Several groups who use our equipment have also published their results openly. Some of those who measure rail corrugation and acoustic roughness mention that a CAT has been used as if no further reference is required: the CAT is their accepted standard. The volume and quality of literature that cites RailMeasurement equipment in this area is second to none.
We are keenly aware of our responsibility to support our clients with equipment of the highest standard in accuracy, reliability, ease of use and independent verification. Some of the original CATs that were supplied in the late 1990s and early 2000s to railway administrations and rail grinding companies are still in use. Some of the earliest grinder-based RCAs have seen more than a decade of use with minimal maintenance, and still measure to microns.
RailMeasurement have contributed to the development of European and other standards in the areas of reprofiling and measurement of corrugation and acoustic roughness on both rails and wheels. This has been done at our own expense: we have no guaranteed home market (indeed well over 90% of our production is exported) and we have never received a government or EU grant other than to subsidise our attendance at trade shows.