68730 ⎘
Control, warning, or like safety means along the route or between vehicles or vehicle trains for controlling traffic in one direction only automatically operated; Track circuits specially adapted for section blocking using alternating current
DEVICE, SYSTEM AND METHOD FOR MONITORING CONDITIONS ON A RAILWAY TRACK
#2System and method for controlling signaling devices along railroad tracks in electrified territory
#3System and method for detecting a break in a railway track
#4Method for detecting the extent of clear, intact track near a railway vehicle