Why is the train ticket from Zhengzhou to Lankao late to 9 o'clock after 5 o'clock?

The train from Zhengzhou to Lankao is late, which should be caused by force majeure factors such as weather or train number adjustment. It is suggested to inquire through the train broadcast or the information display screen of the railway station:

As of 20 16, 10, 16, the train information from Zhengzhou to Lankao is as follows: