A portion of a railway track was damaged when suspected NDFB militants triggered a blast at railway track near Singimari between Kokrajhar and Salakati railway station last evening.The police also recovered another bomb packed in a gas cylinder and 50 metres of electric wire from the spot. The blast partially damaged a portion of a railway track. Railway sources said a goods train was coming on the way when the blast took place.The train was however stopped in time as the railway guard on duty spotted two bombs lying on the track and stopped the train few metres away. Railway services were suspended for a while but later resumed.