Saraighat reaches HWH at 05:10 am.. If its too late, still it would reach HWH by 06:00.. But Tata- Barbil Janshatabdi departs at 06:20... So you can catch the train, but still would be a bit risky... A better option is- take the 18617 Tri-Weekly HWH- RNC ICE Express (via Tatanagar).. It departs HWH at 15:05, and reaches TATA at 18:45..