There have been 13 instances of signalling failure in the railways in the past five years but no incident due to defects in the interlocking signal system, Railway Minister Ashwini Vaishnaw said on Friday in written responses to queries of MPs in Parliament. The minister responded to a barrage of queries from Rajya Sabha members related to the June 2 triple-train accident in Balasore in Odisha, in which 295 passengers lost their lives and 176 sustained grievous injuries.
