Congress leader Digvijaya Singh on Saturday demanded the resignation of Railway Minister Ashwini Vaishnaw in view of the Odisha train accident and cited the example of former Railway Minister Lal Bahadur Shastri. “The Railway Minister, who is an ex-IAS officer of the Odisha cadre, always claimed that the system is foolproof and no accident can occur,” Singh told reporters in Chhatarpur in Madhya Pradesh.