Yes and no. Existing tiger reserves mein se railway lines ja rahi hain, and wahaan extra lines add hone ke proposal sometimes clear bhi ho jaate hain (eg Rajaji, Darrah, ...)
Plus local wildlife enthusiasts ka maanna hai ki shayad Kumbhalgarh mein tigers laane ka proposal cancel ho jaaye, for the reason that it'll clash with the leopard zone of Jawai (which is rapidly receding into the hills), and because Kumbhalgarh is a very thin reserve and so tigers will wander out all the time.
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Anyway the bigger reason it'll get cancelled is because it would be very, very expensive to do this. We are only now beginning to build base tunnels for roadways, but it will be a while before we can do this for railways I think.