Mark wrote: > Group, are there defect detectors in australia, or just usa? > and if not, why is this just a usa system of safety. > thanks There are certainly Hot box detectors, wheel impact detectors, draging equipment detectors in use on several Aust. systems. -- Bruce L. Greening Norrail@optusnet.com.au http://members.optusnet.com.au/~norrail