A man was stabbed in the neck in Danbury and Police have arrested a suspect.  Officers were called to the area of the railroad tracks on Garamella Boulevard around 1:30 yesterday afternoon to check on the wellbeing of a man.  They found him suffering from an apparent stab wound.  The man was transported to the hospital  A suspect description was obtained, and a search of the area turned up a knife in the Still River, which is believed to be the one used in the assault.  22-year old Gregorio Melchor of Danbury was located and arrested.  He and the victim were known to each other, but police have not yet determine a motive for the assault.  Police determined it was not random.  Danbury Police did not have an update on the condition of the victim.