@blogger: it is sleeper class, RT CLS suspended means for the time being the maximum limit for that train booking has been reached. Please try after some time/day. It will/may reopen. It is similar to REGRET/WL1*. For some reason, TATKAL has also got suspended. Maybe they are considering attaching another coach. Either of the two above mentioned is possible. Tatkal will open only on 16th for journey on 18th!. Wait for Monday.