Development of Measuring Instrument for Contact Wire Wear
Tetsurou TAKAHASHI, Hiroki NAGASAWA
 It is important for maintenance of contact line on electric railways to measure 
the residual hight of contact wire. For the purpose of it, an system using Na
lamp and line sensor camera have been studied. 
 Field tests on an experimental device were carried out successfully. Using the 
results of field tests, a new instrument was manufactured in order to install on 
the roof of an electric car.