Can seats become available after chart preparation?

Yes, seats can become available even after chart preparation. The railway shows all unbooked berths and last-minute cancellations as chart vacancy once the chart is prepared. These vacant seats can be booked from the station counter or through the TTE on board the train. This is why chart vacancy is a useful tool for passengers who need to travel urgently. Some travellers specifically wait for the chart to be prepared to check if any berths have opened up due to cancellations. The chart vacancy information is updated in real time and shows the exact number of empty berths in each coach.