Live Wire: Railroad crossing gates triggered by approaching trains
Q: How much time between the time that the train comes and the stop arm goes down to stop the traffic? — S.B., Hope MillsA: If we’re interpreting the question correctly, you want to know how long it takes for the automatic system to detect an oncoming train and activate the signals at the next railroad crossing.The sequence works something like this: The detection system uses the steel wheels and the steel axle of the train […]
