Detection system for railway cars

Claim 1

A SYSTEM FOR DETECTING THE PRESENCE OF A RAILWAY CAR TRAVERSING A TRACK SWITCH IN A CLASSIFICATION YARD WHEREIN SAID TRACK SWITCH IS INCLUDED IN AN ELECTRICALLY ISOLATED DETECTOR TRACK SECTION AND IS OPERATED TO ITS OPPOSITE POSITIONS BY A POWER SWITCH MACHINE, SAID SYSTEM COMPRISING DETECTING MEANS POSITIONED TO BE EFFECTIVE INTERMEDIATE THE ENDS OF SAID TRACK SECTION TO DETECT A CAR TRAVERSING THE TRACK SWITCH, A DETECTOR RELAY OPERATIVELY CONNECTED TO SAID DETECTING MEANS EFFECTIVE TO BE OPERATED TO ONE POSITION WHEN A CAR IS BEING DETECTED AND OPERATED TO ITS OTHER POSITION WHEN THE TRACK SWITCH IS VACANT OF A CAR, A TRACK RELAY, A CHECKING RELAY, A NORMALLY CLOSED TRACK CIRCUIT MEANS INCLUDING A SOURCE OF ENERGY CONNECTED ACROSS THE RAILS OF SAID TRACK SECTION AND THE WINDING AND A FRONT CONTACT OF SAID TRACK RELAY AND A CONTACT OF SAID DETECTOR RELAY IN ITS ONE POSITION TO CAUSE SAID TRACK RELAY TO REMAIN ENERGIZED WHEN SAID TRACK SECTION IS VACANT OF A CAR, CIRCUIT MEANS INCLUDING SAID CHECKING RELAY EFFECTIVE TO ENERGIZE SAID CHECKING RELAY TO SHUNT SAID FRONT CONTACT OF THE TRACK RELAY WHEN SAID DETECTOR RELAY IS IN ITS OTHER POSITION, STICK CIRCUIT MEANS INCLUDING A FRONT CONTACT OF THE CHECKING RELAY EFFECTIVE TO HOLD SAID CHECKING RELAY ENERGIZED WHEN SAID TRACK RELAY IS DEENERGIZED AND SAID DETECTOR RELAY IS IN ITS OTHER POSITION, AND CIRCUIT MEANS INCLUDING A FRONT CONTACT OF SAID TRACK RELAY EFFECTIVE TO RENDER SAID SWITCH MACHINE OPERATIVE, WHEREBY THE OPERATION OF THE DETECTOR RELAY FROM ONE POSITION TO THE OTHER BY A CAR TRAVERSING THE TRACK SWITCH IS REQUIRED TO ENERGIZE SAID TRACK RELAY UPON THE VACATING OF THE TRACK SECTION AND TRACK SWITCH BY A RAILWAY CAR.

Claim 2

A SYSTEM FOR DETECTING THE PRESENCE OF A RAILWAY CAR TRAVERSING A TRACK SWITCH IN A CLASSIFICATION YARD WHEREIN SAID TRACK SWITCH IS INCLUDED IN AN ELECTRICALLY ISOLATED DETECTOR TRACK SECTION AND IS OPERATED TO ITS OPPOSITE POSITIONS BY A POWER SWITCH MACHINE, SAID SYSTEM COMPRISING DETECTING MEANS POSITIONED TO BE EFFECTIVE INTERMEDIATE THE ENDS OF SAID TRACK SECTION TO DETECT A CAR TRAVERSING THE TRACK SWITCH, A DETECTOR RELAY OPERATIVELY CONNECTED TO SAID DETECTING MEANS EFFECTIVE TO BE OPERATED TO ONE POSITION WHEN A CAR IS BEING DETECTED AND OPERATED TO ITS OTHER POSITION WHEN THE TRACK SWITCH IS VACANT OF A CAR, A TRACK RELAY, A CHECKING RELAY, A NORMALLY CLOSED TRACK CIRCUIT MEANS INCLUDING A SOURCE OF ENERGY CONNECTED ACROSS THE RAILS OF SAID TRACK SECTION AND THE WINDING AND A FRONT CONTACT OF SAID TRACK RELAY AND A CONTACT OF SAID DETECTOR RELAY IN ITS ONE POSITION TO CAUSE SAID TRACK RELAY TO REMAIN ENERGIZED WHEN SAID TRACK SECTION IS VACANT OF A CAR, CIRCUIT MEANS INCLUDING SAID CHECKING RELAY EFFECTIVE TO ENERGIZE SAID CHECKING RELAY TO SHUNT SAID FRONT CONTACT OF THE TRACK RELAY WHEN SAID DETECTOR RELAY IS IN ITS OTHER POSITION, STICK CIRCUIT MEANS INCLUDING A FRONT CONTACT OF THE CHECKING RELAY EFFECTIVE TO HOLD SAID CHECKING RELAY ENERGIZED WHEN SAID TRACK RELAY IS DEENERGIZED AND SAID DETECTOR RELAY IS IN ITS OTHER POSITION, AND CIRCUIT MEANS INCLUDING A FRONT CONTACT OF SAID TRACK RELAY EFFECTIVE TO RENDER SAID SWITCH MACHINE OPERATIVE, WHEREBY THE OPERATION OF THE DETECTOR RELAY FROM ONE POSITION TO THE OTHER BY A CAR TRAVERSING THE TRACK SWITCH IS REQUIRED TO ENERGIZE SAID TRACK RELAY UPON THE VACATING OF THE TRACK SECTION AND TRACK SWITCH BY A RAILWAY CAR.