Importance

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Abstract

A first unit configured to generate and transmit a code of positive and negative DC pulses through a first rail of a railway. A second unit spaced from the first unit and configured to sense the code, which includes a leading code word, having a positive or negative timing pulse followed after a first data interval by a positive or negative data pulse, followed by a modifying code word. The modifying code word consists of a second positive or negative timing pulse followed after a second data interval by a second positive or negative data pulse. The second timing pulse starts after one code cycle from the start of the leading code word timing pulse. The second timing pulse and the second data pulse duplicate the timing pulse and the data pulse of the same polarity, but invert the timing pulse and the data pulse of opposite polarities.

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First Claim