Why did the train from Jinghe to Urumqi suddenly disappear on February 4, 2022/KLOC-0?

20221February 4th The train from Jinghe to Urumqi didn't stop. Train Z304 is currently out of service. According to the railway network notice, the 65438 train will resume operation on February 28th. Train Z304 has 26 stops from Shanghai Station to Yining Station, leaving at 2 1: 00 and arriving at 22: 13 on the third day. The whole journey takes about 46 hours and 55 minutes. The train diagram of Z304/Z305 passes through Shanghai Station, Suzhou Station, Wuxi Station, Nanjing Station, Bengbu Station, Xuzhou Station and Shangqiu Station.