electronic variable message and destination signs and displays; namely, mobile electric signs for rail and bus vehicles, stationary electric signs for bus stops, [ toll booths, highways, and the like, and electric displays for gasoline pumps; controllers for ] variable message electric signs; [ electro-magnetic status indicators and display modules;] public address systems; namely, microphones, amplifiers and loudspeakers; optical filters; electric emergency escape path lights [ electro-magnetic door operators and door controllers; antennas, interrogators, readers, transponders, speed controls, electrical relays, power converters; automatic vehicle identification and control apparatus; namely, antennas, interrogators, readers and transponders; train speed controllers and indicators; vehicle traction controllers; train event recorders; namely, for speed, acceleration, brake functions, engine temperature, generator load conditions ]

equipment for railroad and airborne vehicles; namely, vehicle doors, vehicle door operators