After the high-speed rail ticket was changed, it missed the train and was directly invalidated. Overlord clause

Your understanding is biased. No refund after driving can't be said to be the overlord clause. According to the railway passenger transport regulations, if there are special circumstances, all the fares can be refunded within two hours after driving, and it is necessary to prove that there is an emergency or illness. Besides, if you don't catch the current train, you can transfer to the train behind.