{TAIL ~ A gauging device} for measuring the accuracy of the rate of taper of a tapered, arcuate brake block at a first measuring point and {HEAD ~ a second measuring point} comprising: 
{ TAIL ~ A gauging device } for measuring the accuracy of the rate of taper of a tapered , arcuate brake block at a first measuring point and { HEAD ~ a second measuring point } comprising :
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH