Transmission Line Crossings of Railroad Rights-of-Way

Allen H. Babcock
1910 Transactions of the American Institute of Electrical Engineers  
It is necessary to protect: 1. The railroad communication circuits (telegraph, telephone and signal) from mechanical injury and from contact with high tension wires. 2. The train crews from personal injuries due to sagging or fallen wires. 3. The trains themselves from mechanical damage and from the liability of fire should a wreck occur at the crossing point. 4. The railroad structures from damage by fire due either to crosses between communication circuits and fallen or sagging transmission
more » ... ging transmission circuits, or to high potential electromotive forces induced therein by excessive unbalancing of the transmission circuits. Having in mind the fact that contact with transmission circuits is dangerous to both life and property, it was natural that the early attempts at protection were of the nature of guard wires, in some form or other. Many of us have had experience with some such device. Nearly all of us who have had sufficient experience have found unsatisfactory all forms of guards as yet devised. Even those of the deep basket type have failed at times to give complete protection. Furthermore, any pole line is worked at about minimum factor of safety; hence, to increase the load on it at the very point where maximum security is demanded is an engineering anomaly. Prophecy after the fact is easy. The next step is obvious; to construct the transmission line with maximum factor of safety both in the crossing span and also in each of the adjacent spans, so that nothing short of a 905
doi:10.1109/t-aiee.1910.4764648 fatcat:lsukkvs5enazdbgkg646l2h7lm