Dude . . . Puntamba- Rotegaon is not feasible ! . . . See
/blog/post/1698777 my blog ! . . . Plus it will serve only purpose for Shirdi . . Kopargaon -Rotegaon is cheaper . . . Also AWB bound trains from Mumbai can be diverted via this route ! . . . Hence it will provide indirect connectivity for Mumbai from Shirdi . . Hence no need of special trains for Shirdi