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1973年11月24日交通部工电局以(73)交工电电字1457号文通知各铁路局、铁路工程局、铁路设计院,采用三线制道岔电路。这是经过总结二线制道岔电路存在的问题,并由交通部电务工程总队进行调查研究和改进试验,经审查后决定的。目前,我国铁路上的电气集中车站,大部分是采用二线制道岔电路,这个电路的缺点是当设备发生故障时,能错误表示道岔位置,危及行车安全。
November 24, 1973 Ministry of Communications Bureau of Industry and Electricity (73) to pay the letter No. 1457 Electrical Notice to the Railway Administration, Railway Engineering Bureau, Railway Design Institute, the use of three-wire turnout circuit. This is a summary of the existing problems of the second-line turnout circuit, and by the Ministry of Communications Engineering Corps survey research and improvement tests, after the review of the decision. At present, most of the centralized railway stations in our country use the two-wire turnout circuit. The disadvantage of this circuit is that when the equipment fails, it can incorrectly indicate the position of the turnout and endanger traffic safety.