TQGKJ15 photoelectric speed sensor TQG15 photoelectric speed sensor junction box, junction box, GDY80 Metro HXD3 battery voltage meter, voltage meter, electronic controller HB-1 HB-2 wheel rail lubrication, wheel rail lubricating electronic controller, HB-3 wheel rail lubricating electronic controller, TQGKJ15 photoelectric speed sensor junction box, DF-J0002 voltage signal transmitter, DF-J0003 current signal transmitter. TAG：