Purushottam Express might be a good choice for passengers from Kolkata for going to Puri and Delhi.
If you can't get a seat in Puri/Delhi Bound train from Kolkata, you can take Purushottam Express.
1)...
more... For going towards Puri
Take Howrah Medinipur Local at 6:10 pm and reach Kharagpur and then take a Toto towards Hijli station, they will take arround 150 bucks. And then take 12802 Purushottam Express from Hijli.
2) For going towards Delhi
You have to reach Hijli station by 10 pm, it's not recommended to reach Hijli arround 12 to 1 am for your safety. You will have waiting room for resting. After resting, take 12801 Purushottam Express from Hijli to Delhi.