You need my ID card if you don't cross the province. If it is across provinces, you need to show your health code.
Now is the time when the epidemic is serious. Don't take the train unless there is something important. If you must take the train, please take a look at the epidemic situation in the place you want to go. If appropriate, you must wear a mask and do nucleic acid testing. This is more reassuring.
If it's not across provinces, you need my ID card. I need to show my Longjiang health code and Longjiang big data if I want to cross provinces. Now it is a serious epidemic. Don't take the train unless there is something important. If you must take the train, please take a look at the epidemic situation in the place where you are going. If appropriate, you must wear a mask and do nucleic acid testing. This is more reassuring.