American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 616
b it will short-circuit the relay b^ thereby setting the signal b at danger,thus showing the officials of any other train that the immediately preceding section(b) is occupied. When the train arrives at section c and leaves the rails of section b,the signal ^is set at danger,while signal ^ is… … OVERLAPPING BLOCK SIGNAL SYSTEM. The overlapping system is also applied to single track roads in a practically sim-ilar way to that just described; signals being placed on each side of the track to indi.cate from which direction trains may be approaching. THE SYKES SYSTEM OF BLOCK SIGNALING. The •…
Telegraph
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