Locomotive remote control system

Claim 1

A REMOTE SPEED CONTROL SYSTEM FOR A LOCOMOTIVE, COMPRISING, A COMMUNICATION MEANS FOR TRANSMITTING DIFFERENT SIGNALS FROM A REMOTE CONTROL STATION TO A LOCOMOTIVE; A FIRST, A SECOND, AND A THIRD TRANSMITTER AT SAID STATION, EACH CAPABLE OF GENERATING A DISTINCTIVE TONE SIGNAL WHEN ACTUATED AND CONNECTED TO SAID COMMUNICATION MEANS FOR TRANSMISSION OF THAT SIGNAL; A FIRST AND A SECOND CONTROL FUNCTION SELECTOR FOR MOMENTARILY SELECTIVELY ACTUATING SAID FIRST AND SECOND TRANSMITTERS; A FIRST, A SECOND, AND A THIRD RECEIVER AT SOME LOCOMOTIVE HAVING CONNECTIONS TO SAID COMMUNICATION MEANS FOR DETECTING THE TONE SIGNALS FROM THE CORRESPONDING TRANSMITTERS; SPEED CONTROL MEANS CONTROLLED BY SAID FIRST AND SAID SECOND RECEIVERS FOR RESPECTIVELY INCREASING AND DECREASING THE LOCOMOTIVE SPEED BY INCREASING AND DECREASING THE APPLIED POWER BETWEEN THE ZERO AND A MAXIMUM AS FIRST AND SECOND TRANSMITTER TONE SIGNALS ARE RECEIVED, CONTROL MEANS HAVING CONNECTIONS WHEN OPERATED FOR CONTINUOUSLY ACTUATING SAID THIRD TRANSMITTER, AND A CONTROL CONNECTION BETWEEN SAID THIRD RECEIVER AND SAID SPEED CONTROL MEANS AND RESPONSIVE TO SAID THIRD RECEIVER FOR OVERRIDING THE CONTROL OF SAID FIRST AND SECOND RECEIVERS AND IMMEDIATELY DECREASING THE LOCOMOTIVE SPEED TO ZERO WHEN ABSENCE OF THE THIRD TRANSMITTER TONE SIGNAL IS DETECTED.