QUOTE from news article :
"1. On the IRCTC website, a new option of view “Charts/Vacancy” is being made available.
2. The train journey details such as train number, journey date and boarding station will be required as an input from the user and after that the class-wise and coach-wise number of vacant berths can be seen.
3. The user can also click...
more... on a specific coach to see the layout along with berth-wise accommodation status such as; occupied for full journey, occupied for part journey and vacant for full journey.
4. The position of berth allocated to a PNR in the coach layout can be seen in PNR Enquiry & book ticket history."
Once the procedure is in place & checked by user, more clarity will come