电气集中车站，道岔错误表示所引起的行车重大事故，几乎都是由于施工者在更换转辙机或整理电缆配线时，误将控制线的配线颠倒，在道岔既无表示又不能转换的情况下，不经查找故障原因，便盲目颠倒半波整流器方向，造成道岔位置与控制台道岔表示不一致，事后又不认真核对室... Almost all of the major accidents caused by the electrical centralized stations and turnouts are due to the contractor mistakenly inverting the wiring of the control line when changing the switch machine or arranging the cable wiring. In the event that the switch has neither indication nor conversion Case, without finding the cause of the malfunction, blindly upside down half-wave rectifier direction, resulting in the switch position and the console switch is inconsistent, and afterwards do not carefully check the room ...