Interlocking system for railroads

Claim 1

A SWITCH AND SIGNAL CONTROL SYSTEM FOR A TRACK LAYOUT HAVING A PLURALITY OF DIFFERENT AND CONFLICTING ROUTES AND BEING OF THE TYPE HAVING ROUTE ESTABLISHING MEANS EFFECTIVE WHEN ACTIVATED TO OPERATIVELY CONTROL CERTAIN OF THE SWITCHES AND SIGNALS FOR A DESIGNATED ROUTE COMPRISING, (A) TRAIN IDENTITY MEANS CONTROLLED BY THE APPROACH OF A TRAIN OF THE TRACK LAYOUT FOR REGISTERING THE IDENTITY OF THE APPROACHING TRAIN, (B) ROUTE STORAGE MEANS OPERATIVE TO RANDOMLY STORE CONTEMPORANEOUSLY THE IDENTITIES OF A PLURALITY OF PREDETERMINED CONFLICTING ROUTES THROUGH THE TRACK LAYOUT, (C) READOUT CIRCUIT MEANS RESPONSIVE TO A TRAIN IDENTITY REGISTERED BY SAID TRAIN IDENTITY MEANS TO CAUSE THE STORAGE MEANS TO SELECTIVELY ACTIVATE THE ROUTE ESTABLISHING MEANS IN ACCORDANCE WITH A PREDETERMINED STORED ROUTE IDENTITY AND TO CANCEL SAID PREDETERMINED STORED ROUTE IDENTITY IN THE STORAGE MEANS, AND (D) READBACK CIRCUIT MEANS RESPONSIVE TO SAID READOUT CIRCUIT MEANS FOR RESTORING SAID CANCELLED ROUTE IDENTITY IN SAID STORAGE MEANS.