Hello: Kaifeng has it, and Lankao has it? Book tickets ten days in advance to Ningbo! It's the rush hour in Spring Festival travel rush, and it's even more serious that one ticket is hard to get! It is recommended to buy it at the train ticket sales point, that is, pay a few more dollars.
Let me introduce the train number to you: K656/K657 Time: 15:00-06:00 Hard sleeper/Hard sleeper: 143-226-254-400. Have a nice trip!