Since I wasn't travelling all that much by train (and HDFC Infinia gives comparable reward points via smartbuy from train travel), I asked to change my SBI IRCTC premier card to something else. They could provide no option. So I put in a request to cancel the card. Got a call, I explained the reasons, and they made it lifetime free.
Hmm. I already hold 3 cards, was hoping to surrender this, and apply for BPCL High Octane card. I guess I'll try to cancel another card and try.