KOCHI: Prime Minister Narendra Modi will launch the state-of-the-art redevelopment of the Ernakulam south, north and Kollam railway stations, virtually, on Thursday. The Ernakulam south and north stations will be redeveloped at a cost of Rs 445 crore and Rs 226 crore, respectively. Both station buildings will be demolished in three phases and replaced with multi-storied ones in two years, said an official. Test piling was done at the Ernakulam south station earlier this month. The estimated cost for Kollam station is Rs 388 crore.