Brake control apparatus for unmanned trains

Claim 1

IN AN APPARATUS FOR AUTOMATICALLY CONTROLLING THE BRAKES OF A TRAIN AFTER IT REACHES A PREDETERMINED POINT ON A RAILWAY TRACK SO THAT THE TRAIN WILL ALWAYS STOP WITHIN A PREDETERMINED ZONE AT A PRESELECTED DISTANCE BEYOND SAID POINT, THE COMBINATION OF: TRAIN-CARRIED MEANS CONDITIONED UPON THE TRAIN REACHING SAID POINT TO INITIATE AN APPLICATION OF TRAIN BRAKES, TIMING MEANS SET INTO OPERATION UPON THE TRAIN REACHING SAID POINT FOR THEREAFTER MEASURING OUT CERTAIN TIME PERIODS INDEPENDENTLY OF MOVEMENT OF THE TRAIN ALONG THE TRACK, MEANS CONTROLLED BY TRAIN SPEED, MEANS CONTROLLED BY SAID TIMING MEANS AND SPEED-CONTROLLED MEANS TO SELECT A DESIRED RATE OF DECELERATION FOR THE TRAIN DURING AT LEAST SOME OF THE TIME PERIODS ACCORDING TO HOW THE ACTUAL TRAIN SPEED COMPARES WITH AN IDEAL TRAIN SPEED AT THE COMMENCEMENT OF EACH SUCH PERIOD, AND MEANS CONTROLLED BY THE LAST-INTRODUCED MEANS TO ADJUST THE DEGREE OF BRAKE APPLICATION AS NECESSARY TO MAINTAIN DECELERATION AT SUBSTANTIALLY SAID DESIRED RATE.