Fault Diagnosis of Signal Equipment on the Lanzhou-Xinjiang High-Speed Railway Using Machine Learning for Natural Language Processing

Table 1

Example of signal equipment fault data.

Num	Railway section	Department	Fault location	Equipment type	Failure overview	Cause analysis
1	Lanzhou	Minhe South	Qin’an to Tongwei	Switch equipment	At 21:25 on March 14, 2019, 7 turnouts positioning of Minhe south station was not indicated, which affected the d2708 stops of Minhe south station for 10 minutes. After on-site treatment, 21:51 positioning indicated restoration and 21:56 distribution record.	During the centralized maintenance of Minhe South station on March 14, on-site operators failed to grasp the seasonal changes and improperly adjusted the gap of 7#X1, and the card gap caused no indication of the positioning of the 7# turnout.
2	Jiayuguan	Jiayuguan South	Jiuquan South	Switch equipment	At 16:28 on April 6, 2019, no switch reverse indication in no. 6 turnout of Jiuquan South station of Lanzhou Xinjiang passenger dedicated line. After the on-site inspection and treatment by the staff, the equipment was opened and returned to normal use at 17:19.	When the no. 6 turnout J1 machine is switched from the positioning to the reverse position, the lock hook is not strong, resulting in no switch reverse indication of the no. 6 turnout reverse position.
3	Lanzhou	Lanzhou West	Lanzhou West railway station	Train-control equipment	At 9:38 on April 21, 2019, the CRH380B-5734 EMU of the Lanzhou Depot of the Lanzhou bureau Group Company was responsible for the 0G846 train traction task. When leaving the station, the CRH380B-5734 EMU was caused by “the emergency braking of whole trains was not relieved” the group cannot leave.Replaced with CRH380B-5641 EMU to take on the 0G846 train traction task. CRH380B-5641 EMU departs at 10:16, leaving 38 minutes late.	The code sending signal of the locomotive signal code box is abnormal, causing the EMU to display an emergency braking state.
4	Jiayuguan	Yumen	Liugou South	Switch equipment	At 5:14 on June 16, 2019, no. 6/8 turnout of Liugou South station was reversed and there was no switch reverse indication. After inspection and test, it was opened at 6:07 and the equipment was restored to normal use.	The lock hook on the reverse side of the no. 6 X2 machine is not strong, causing no switch reverse indication of the reverse position of the no. 6/8 turnout.
5	Lanzhou	Lanzhou West	High-speed trains yard	Track circuit	At 22:36 on August 21, 2019, when the D1 track car was driven into the high-speed field from the EMU, the 401DG and 235DG lost train occupation prompt.	On-site inspection at 23:10 revealed that the rail surfaces of the two track sections of 235DG and 401DG were rusted severely, the rail wheel pairs were rusted, and the rail car was lighter and failed to fully fit the rail surface. These three factors led to the track circuit. The shunt is poor, causing the loss of the D1 track car occupation prompt.