We all know that building and expanding the city's lifeline is expected to come at a huge cost. But, the question on everyone's mind is who will take on that financial burden. If railway sources in Mumbai are to be believed, the Centre is reluctant to invest money in the proposed Virar-Vasai-Diva-Panvel suburban line -- pegged at Rs. 9,000 crore -- and has written to the state to contribute more towards the project.