The situation was not complicated; the reason was that the station master at the main station had used connections during the construction of the tracks. After the tracks were built, it didn't take long for problems to arise. The station master was afraid to publicly disclose the reason, and since there weren't many scheduled services on this route, he temporarily closed the tracks and announced internally that it was normal reinforcement, and arranged for a group of people to repair it.
But in fact, the section of the track passing through the tunnel had not only issues with the road but also problems with the tunnel itself. The workers responsible for clearing and repairing reported this matter, but after the station master arranged for a "professional" to inspect it, he switched to another group.
