bcoz other zones are working for Passenger but ECR is working for Patna and Black money.
Ecr is limited to ganga paar i.e. patna gaya Mughalsarai.Aisa nahi hai ki ye sab trains 45-50 ke average pe nahi chal sakti,in sab ko jaan boojh ke below 35 pe chalaaya jaa raha hai.
isiliye bridge banne ke 2 years baad bhi mfp se gaya ara buxar mgs se connect nahi ho saka