The Government Railway Police (GRP) in Mumbai cracked a murder case in less than 14 hours, with the arrest of a 21-year-old man who allegedly killed a woman, stuffed her body in large plastic bags before dumping it on the railway tracks here, police said. The GRP at Mumbai Central arrested Vikas Jagan Khairnar for allegedly brutally killing Sarika Damodar Chalke (30), a resident of Goregaon, over a monetary dispute, an official said.