Soil erosion below the railway tracks led to the derailment of the Guwahati-Bangalore Express and the subsequent collision with the Azimgunj Fast Passenger in Malda district of West Bengal on Sunda
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/soil-erosion-led-derailment-initial-probe
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/indian-express-new-delhi
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/soil-erosion
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/rail-transport
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/maldah