Railways is considering to float green bonds, to fund its clean energy projects ,a senior Railway Ministry official on Saturday said.Railways have undertaken a series of clean energy projects like, setting up solar and wind energy plants and waste to energy plants to reduce its dependence on conventional energy.While rooftops of many trains and station buildings are being used for solar panels, some coaches and platforms are currently illuminated with solar power.Railway Ministry, is moving away from Gross Budgetary Support the Centre's financial assistance, and is exploring innovative financing models to fund priority projects.