System of detectors installed at four locations, purpose of which is to give warning of presence of damaged or loosened parts of locomotives or cars which might be hanging or dragging below level of top of rail, and which might cause derailments when trains are running through switch layouts such as those at large interlockings.
Pennsylvania installs devices to detect dragging equipment
By Signaling
Railway Signaling ; 29 , n 11 ; p 567-568 + 570
1936
Article (Journal)
English
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