IRCTC reservation failed transaction is also now very common reason of refund.If your account has been debited or charged but ticket not issued,IRCTC will refund full money without any extra refund charge.IRCTC will credit your amount to the same debit or credit card which has been applied for paying.But if the bank charged you for using debit card or credit card at the time of transaction,this charges are likely to be forfeited.
IRCTC can’t guarantee you for its accurate date to be reflected money in your bank account.IRCTC team works hard to complete all the pending task but still it might get delay.Therfore you need to wait few days until previous refund queue is over and your refund start processing.