Investment in the signaling & communication is the most cost effective and easily implementable solution to increase the carrying capacity of a saturated section of track. But IR has always resorted to costlier option of going for tripling which is costlier, time taking and involve tedious land acquisition, thaks to the engineering deptt. often bulldozing the relatively weaker deptt called signalling.
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Only after going for advances train control as precondition to sanctioning of MUTP-III, did IR opted to go for it on the harbour line of Mumbai suburban Network.
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Such kind of financially beneficial modernisation has to be embarked upon big way in IR, the newly reconstituted infrastructure directorate incorporating civil as well as signalling should come handy in this respect.