Rupashi bangla exp route is via nmp to kgp.for that the fare from prr is 400 rs in ac chair car.where as the fare of prr sf exp is 390 rs from prr to kgp via giri maidan.now rupashi bangla exp after doubling gokulpur kgp line goes through that route only.so psngrs are well paying 10 rs extra for same distance n same route that is covered by prr sf exp.good job ser.saving 10 rs per psngr in ac coach.