Kalyan: The Government Railway police of Kalyan have arrested four people and detained a minor for committing robbery in running an express train. The police said the accused is from Pune and threatened the victim with a knife to take her bag containing mobile phone and cash. Alert passengers who noticed the robbery, closed both the doors of the boogie and informed the police. The GRP and Railway police force reached the spot to arrested the accused and detained the minor. The police said the arrested accused are identified as Tabrez Munir Shaikh 19, Danish Khan 19, Ajay Dabade 20 and Nizam Sh…