If you have already purchased the ticket for the Z90 train, you can contact the relevant railway department or your travel agency to learn about the follow-up arrangements such as refund and change. Usually, the railway department will provide corresponding solutions according to the specific situation to minimize the inconvenience caused to passengers.
At the same time, if you have any questions about this incident or need further help, I suggest you get in touch with relevant departments or institutions directly, and they can provide more specific and accurate information.