Rajdhani and purushottam are getting Wap7 from NDLS but you must b knowing tht purushottam gets it only up to KGP.. And now the same thing is most probably happening with BBS Rajdhani and at KGP I think it's loco is being changed from WAP-7 to SRC WAP-4.. i m saying this coz if Wap-4 is given to Rajdhani from NDLS then GZB WAP-4 is given, not SRC WAP-4..