ye kaisi baat kar rahe hain bandu! SER me bahut se aise trains hai jinko proper passenger locos bhi nahi milta hai aap khud hi 12261 and 12221 ko dekhiye duranto ho ke bhi ER Ki WAP-4 use kar rahe hain that means SRC ke khud ke wap-4 kitne busy honge jo unko dusron se engine lena pad raha hai aise me sirf TATA hi ha jisko 3 Phaser maintenance ka tajurba hai aise me TATA ko WAP-7 allot karne se SER zone ki hi musibat hal hogi aur ER ki bhi usko extra locos kisi aur se nahi lene padenge apni jarurat puri karne ko. Yaad rakhiye WAP-4 production band ho chuka hai aise me naya P-4 lene ka to swal bhi nahi hai ab to P-7 hi lena padega.