India's Worst Train Disasters: Signal Faults and Human Error Suspected Causes

India's railway minister has suggested a signal fault led to the Odisha rail disaster, with a "change in electronic interlocking" the likely cause. Meanwhile, the death toll has been revised down to 275 after some bodies were counted twice, officials said. The crash saw a passenger train collide with a stationary goods train and derail, after being wrongly directed onto a loop track by the side of the main line. India has one of the largest train networks in the world with millions of passengers using it daily, but a lot of the railway infrastructure needs improving.