What RAC 12 means
RAC 12 means you are at waitlist position 12 in the Reservation Against Cancellation (RAC) pool. RAC guarantees boarding on a shared side-lower berth. Unlike WL, RAC passengers always travel. At this position, the confirmation rate is approximately 45–60% — rated Moderate.
RAC 12 probability by route and class
RAC 12 possible but not guaranteed. This varies by route (busy metro routes like Delhi-Mumbai or Delhi-Kolkata have more cancellations), class (Sleeper class moves faster than AC classes because it has more seats), season (festival periods have fewer cancellations and lower confirmation rates), and how many days remain before chart preparation.
What to do now
You will travel on a shared side-lower berth. A full berth upgrade is possible, especially on long-distance trains where passengers alight at intermediate stations.
How RAC 12 compares
For reference: RAC 7 has a 60–75% probability and RAC 17 has a 30–45% probability. A full breakdown is available in the Reservation Against Cancellation guide at pnralert.in/blog/rac-ticket-meaning-will-it-get-confirmed.