Best credit card for frequent IRCTC AC train bookings?

26, salaried, ₹1L/month, CIBIL 780+

I travel 2–3 times a month with my wife, mostly in 2AC/3AC. Lounge access isn’t important.

Which credit card offers the best overall value for IRCTC bookings after considering:

1. Rewards/cashback
2. IRCTC convenience fee waiver
3. Reward redemption fees/charges
4. Any hidden costs or caps

Looking for recommendations based on actual usage.