TATA-BXR train start karne ke liye ECR se problem hai as I read somewhere (might be on twitter). SER can run but ECR isn't allowing now.
Aur phirr BXR par termination nahi ho sakta 18183/84 ka kyonki BXR isn't well developed. Phirr wapis aana padega Patna region mein for maintenance nahi toh DDU bhejega.
Agar...
more... DDU tak extend karega tab 201 km extra cover karna hoga jisse train ko atleast 4-4.5 hours chahiye cuz it is a mail express. Tab train raat 12 baje pahunchegi aur phirr timings thoda odd ho jaayega. Subah start karna bhi padega toh raat 1:30 mein karna padega tab exactly present timings se match karega train