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双音多频是国际电报电话咨询委员会（CCITT）制定的音频通信控制方案，它传输距离远，抗干扰性能好，适宜于普通市话电缆在铁路编组站这种干扰较大的场所进行传输。脱轨器是列检用于人身安全防护的一种安全设施。在列检人员开始作业前，列车两头要插放脱轨器以避免意外情况下造
Dual-tone multi-frequency is an audio communication control scheme developed by the International Telegraph and Telephone Consultative Committee (CCITT). It transmits long distances and has good anti-jamming performance. It is suitable for ordinary local telephone cables to be transmitted in places with high interference such as railway marshalling stations. Derailment is a safety device for personal safety. Before the inspectors start work, the train should be inserted at both ends of the derailer to avoid accidents under