Patent ID: 6113037
Filing Date: 2000-09-05
Classification: B61L

Abstract:
A system for alerting a maintenance-of-way railroad crew working in a construction zone on a section of an active railroad track to the presence of an oncoming train, the system comprising:(a) a crew warning device for alerting the maintenance-of-way crew to the presence of the oncoming train;(b) a first sensor probe positioned adjacent to the railroad track at a predetermined distance from the construction zone for detecting the train as it enters the construction zone and producing a first train detection signal in response thereto;(c) a first sensor unit coupled the first sensor probe for receiving the first train detection signal and transmitting a first train indication signal thereupon;(d) a second sensor probe positioned adjacent to the railroad track at a predetermined distance from the construction zone for detecting the presence of the train as it leaves the construction zone and producing a second train detection signal in response thereto;(e) a second sensor unit coupled to the second sensor probe for receiving the second train detection signal and transmitting a second train indication signal thereupon;(f) a receiver unit operatively coupled to the crew warning device, the receiver unit activating the crew warning device upon receiving the first train indication signal and deactivating the crew warning device upon receiving the second train indication signal.