1. The water cup can be checked by train. In order to ensure the safety of trains and passengers, the railway department will follow the principle of "every package must be inspected and every liquid must be drunk", requiring passengers to try the cups and drinks they carry with them. Of course, the premise of inspection is that there is water in the cup and the drink is open. If the beverage you carry is well sealed, the staff will check it, but they will not force you to open the bottle and try it. In general, liquid is the focus of railway security inspection. In addition to cups and drinks, alcohol and cooking oil carried by passengers must also be inspected. For cooking oil, traditional Chinese medicine or other liquids with unidentified materials, the staff will ask passengers to open the container to smell, while bulk liquor, yellow wine and wine are not allowed to be brought into the station or the car.

2. After detecting some common contraband, the staff will register the passenger's ticket information, and at the same time, they will ask their off-duty staff or their families to bring the items back in time. If passengers choose to give up, the station will properly keep and destroy the items in accordance with relevant regulations. Of course, the railway police will inquire and investigate some dangerous contraband, such as gasoline, dichlorvos and sulfuric acid. If you refuse to cooperate, the police uncle will invite you to tea.

3. Therefore, in order to ensure that your trip is not affected, on the one hand, don't bring contraband into the station to get on the bus, and at the same time arrive at the station for security check in advance to avoid being delayed by security check before driving. On the other hand, it is suggested to carry empty teacups, which can improve the efficiency of passing the security check smoothly. There are drinking fountains at stations and trains, so it is not too late to turn on the water after entering the station or getting on the bus.