What happens to regular trains that are more than twelve hours behind schedule?

When regular trains fall more than twelve hours behind schedule, they lose both their right to proceed as a regular train and their scheduled places in the timetable. This means they are no longer allowed to operate under the same set of rules that govern punctual trains. This is done to help manage the overall train service effectively. In other words, the operational protocol for the rail system necessitates that such significantly delayed trains cannot simply continue on their current schedule but must instead be re-evaluated or re-assigned, as they can create further complications in an already disrupted service pattern. This helps ensure that the schedule remains as efficient and reliable as possible for the remaining trains operating on the network.