A mechanical device fitted to LU trains on non-ATP fitted lines, which is activated if a train passes a signal showing a danger aspect. If activated, it causes an emergency brake application on the train. Found on http://www.trainweb.org/tubeprune/dictionary.htm
A mechanical device fitted to LU trains on non-ATP fitted lines, which is activated if a train passes a signal showing a danger aspect. If activated, it causes an emergency brake application on the train.