The crash happened at Fisherton Tunnel between Andover and Salisbury in Wiltshire, yesterday evening at around 7.30pm.
At least two helicopters landed at the scene, while police and ambulance crews arrived on the ground.
In a statement late last night, British Transport Police (BTP) confirmed there were no fatalities in the incident, but a “small number” of people, including the driver of one of the trains, were taken to hospital to have their injuries ass
A Network Rail spokesperson said: “At around 7pm this evening, the rear carriage of the 1708 Great Western Railway service from Portsmouth Harbour to Bristol Temple Meads derailed after striking an object on its approach to Salisbury station.
“The derailment knocked out all of the signalling in the area. Subsequently, the 1720 South Western Railway service from London Waterloo to Honiton then collided with the Bristol train.”
Here are pictures from the scene last night and this morning.
1. Scene from last night after the crash
The scene near Fisherton Tunnel between Andover and Salisbury where a train has overturned. Photo: SWNS
2. Fire crews called
Firefighters arriving at the scene near Fisherton Tunnel between Andover and Salisbury Photo: Graham Wallen / SWNS
3. Scene before dawn
The trains are both cordoned off following the rescuing of passengers Photo: SWNS
4. Scene from the nearby road
The Rail Accident Investigation Branch and Office of Rail and Road is now investigating the incident. In a statement it said: “We need to understand how this happened to prevent in the future.” Photo: Graham Wallen / SWNS