Graphic time-recording system of corporation has proved successful means for checking regularity of surface trolley car service; equipment consists of 7 Esterline graphic headway-recording instruments and 128 Nachod trolley contractors with associated control apparatus.
Brooklyn and Queens transit Corp. uses automatic headway recorders as part of signaling system
By Signalling
Railway Signaling ; 25 , n 11
1932
Article (Journal)
English
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