wap-7 the most powerfull & efficient new loco for passangers & wag 7 & 9 for goods., majority of superfast are pulled by wap-4 & 5 (ealier used for rajdhani exp) ., now duranto & rajdhani is pulled by wap-7 with few other trains --- even shatabdi is pulled by wap-4 ., and jan shatabdi of bhubneswar is by even older model loco pls .