An express train has ploughed into the back of another near the Indian town of Agra, killing up to 21 people.
The Delhi-bound express train from the southern state of Goa struck the back of the stationary Mewar Express, an overnight service linking the state of Rajasthan with the capital.
The impact of the collision destroyed a couple of train compartments and rescue workers were forced to use cutting machines to reach passengers trapped inside.
The accident occurred at the Mathura city station.
Initial reports suggested the Mewar Express was at a standstill because a passenger had pulled the emergency chain. It is understood the driver of the Goa express had overlooked a signal requesting him to stop.
The state-run railway system - still the main form of long-distance travel in India despite fierce competition from new private airlines - carries 18.5m people daily.
There are 300 accidents on the railways every year. In February, at least 16 people were killed and 60 injured when 12 carriages of a passenger train derailed in eastern India.
