Multi-frequency railroad grade crossing termination shunt assemb
Multiplexing means for motion detectors at grade crossings
Operating mechanism for railroad crossing gate
Railroad accident prevention system with ground-retractable vehi
Railroad crossing arm breakaway connector
Railroad crossing traffic warning system apparatus and method th
Railroad grade crossing constant warning protection system
Railroad highway crossing warning system
Railroad signal system
Railroad warning signal device
Railway crossing collision avoidance system
Railway crossing collision avoidance system
Railway gate system
Road-rail shunt
Shunting device
Slide cam assembly for railroad-crossing gate mechanism
System and method for train operation approaching grade...
System controlling apparatus which compares signals from sensors
Train approach detector
Variable placement interchangeable lamp system