The movement of trains on the Howrah-Mumbai route was affected for several hours on Monday as CPI-Maoist rebels who had called a Bharat Bandh against the policies of the Centre triggered a blast on the railway tracks between Lotapahar and Sonua railway stations, about 80 Kms from here. The spot falls under Chakradharpur division of South Eastern Railways (SER) in West singhbhum district. Though no casualties took place, the powerful blast damaged the railway tracks for about two meters. A major incident was averted, said railway sources. Spokesperson of Chakradharpur railway division, Manish Pathak, said the blast took place at around 2.15 am and the information of the blast was received by the station manager of Sonua from the driver of a goods train.