haan sir wahi toh main v kehna chahta hoon...charles darwin ne v kaha tha,"Survival of the Fittest" & animals should also learn to adapt to environment...agar zyada train chalenge toh unhe hi idea ho jayega ki tracks cross karna dangerous hain & ek ek karke cross kare..ek sath saare nahi...waise v single line section mein agar too much traffic v ho,then also on an avg there is a gap of 25 mts b/w two passing trains...within 25 mts elephants can easily cross tracks...