After reaching from Macherla to Bhimavaram with in 5mnts this train departs as Bhimavaram to Rajamundry MEMU. So instead of two trains one single train can run as Macherla - Rajahmundry passenger.
Yes, DEMU service numbers start with 7 Usually and Passenger service starting with 5. But here IR may run DEMU as Normal/Old Passenger format in return.
Railways can start return train from Bvrm/NS to Macherla. It will definitely help full for pax. As of now many are traveling from Macherla, Gurazala, Sap, piduguralla to Bvrm. But there is no return train.
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