The reservation chart is prepared in two passes. The first chart, now at least 10 hours before departure and the previous evening for early-morning trains, allots coaches and berths to confirmed passengers, clears what waitlist it can, and drops fully waitlisted e-tickets. The final chart, about 30 minutes before departure, adds current bookings made in between.
Everything about a ticket freezes at the first chart: online cancellation closes, the status you have is the status you travel on, and anything you want back after that goes through a TDR.
Also written or searched as: chart prepared · charting · chart preparation · first chart · final chart