Indian Railway officials say at least 12 people have died after two passenger trains collided in the northern Indian state of Uttar Pradesh. The collision took place near Gorakhpur station, about 270km from the state capital, Lucknow. The Express, travelling from Varanasi to Gorakhpur, overshot the signal and rammed into the Express from behind. At least 45 people were injured in the accident, officials confirmed. India's railway network operates 9,000 passenger trains and carries some 18 million passengers every day.