Surging floodwaters are causing extensive damage to rail and road communications in different districts across the country. In Gaibandha, the flood situation has turned critical as water in the Brahmaputra river was flowing 146 centimetres above danger mark at different points of the river. Rail communications between Gaibandha and Bonarpara section remained suspended since Wednesday morning when floodwater gushing over a section of the rail tracks at Trimohoni washed away soil and stone chips from underneath, reports our correspondent in Gaibandha.