Travel in AC with Sleeper Ticket: Indian Railways' Auto-Upgradation Secret Revealed!

• Indian Railways offers a chance to travel in AC coaches with a Sleeper Class ticket through 'Auto-Upgradation'.
• Passengers must tick the 'Auto-Upgradation' option during IRCTC online ticket booking to be eligible.
• If Sleeper Class is full, an AC berth (usually Third AC) may be allotted if available, at no extra cost.
• This facility is exclusively for tickets booked online via IRCTC, not for offline or other platform bookings.
• TTEs also unofficially provide upgrades to RAC, unreserved, and general passengers if berths are available.