Here is a quick and easy way to test the capacity of your lungs. Hold your breath and watch the red ball spin while you count the number of spins. The more number of spins you can hold your breath, better is the health of your lungs.
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First came Anaconda by joining 3 goods train,then 4 were joined to form Sheshnag & now 5 to form Vasuki. In one path,5 trains can move.This gives additional capacity of running 4 more trains. Dont try to count the wagons,you may feel dizzy,they are 295 @IRTSassociation