Performance requestsIn electric railways in Japan, inspection cars are running at commercial speed, in order to measure wear of contact wires. We have developed an apparatus to measure the contact wire wear with a light source of sodium vapor lamps of simpler mechanism and smaller size than that of current apparatus. This appa-
ratus measures the width of wear surface by an optical method, and converts it into a residual height, This apparatus has been used for JR Yamagata Shinkansen in JR. On the other hand, we miniaturized this apparatus further, and developed an overhead contact line inspection system for rail-and-road cars. The results of field tests show that it can be used at a standard deviation of measuring error of 0.3 mm in daytime.The apparatus should have the following performance.(1) It can be used in daytime.(2) The measurement frequency is 500Hz or over to make (3) The measurement range for horizontal deviation is (4) It Can meaSUre maximum four Wires at the Same time. 2.2. The method of measurement the measuring pitch 70" in 130kmh running. 700".In Japan, the cross section of the contact wire has a circular shape with two grooves. Fig. 1 shows the cross section of the contact wire. The wear surface of contact wire becomes flat due to the sliding of pantograph and the size in the direction of height decreases. To measure the
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