At least 64 express and passenger trains were cancelled on Friday owing to agitation by different Kurmi organisations blocking train tracks in the important Kharagpur-Tatanagar and Adra-Chandil sections of South Eastern Railway that have been continuing for three days, an SER official said. Both long distance and local passengers have been suffering immensely owing to the rail blockade by different Kurmi organisations, who have been agitating over a string of demands including recognition as a scheduled tribe, recognition of Sarna religion and inclusion of Kurmali language in the eighth schedule of the Constitution.