actually problem yeh hai ki purvanchal express ka loco link hwh wap4 barauni ke pass 1 hi hai agar yeh loco via cpr-sv hokar GKP tak aa gaya to next day iska route via bmki wdm ke through hoga aur iska wap4 to gkp mein hi reh jayega phir BJU se wap kaha mil payega?? yeh uss case mein possible hai jab barauni se pass extra wap ho jo via bmki wali purvanchal exp mein lag paye nahi to dusra solution yeh hai ki wap+wdm ke through purvanchal express chale via bmki wali taki BJU mein wdm nikal jaye aur wap continue kare journey