India's Prime Minister has promised the "harshest penalty" for those responsible for the deadliest rail crash in decades. 

A preliminary report suggests a signal failure might be to blame for two trains colliding, forcing mangled carriages off the tracks in Odisha. 

Authorities say rescue work has finished, confirming more than 300 people have died and over 900 are injured. 

Passenger Guru Kalai is among those who have been badly injured. 

“I was standing near the doors when the two carriages crushed us,” he said. “There were four of us.” 

“I felt hurtled as I was thrown out of the carriage and got out – I got hurt on my head, arms and legs. It hurts badly.” 

"Guilty"

Prime Minister Narendra Modi said anyone "guilty" should receive the "harshest punishment" - but railway engineer Professor Roderick Smith said this statement is “unwise”.  

“It might well be government ministers who are responsible for not providing the right equipment or for asking people to work long hours,” he said.  

“Let’s reserve judgment until we know exactly what's happened.” 

"Warzone"

Former India Railways Board worker Rakesh Chopra visited the site of the crash and said he “had no words to explain" what he saw. 

“Standing there and being able to see so many coaches which have collapsed - it's a big, big tragedy,” he said.  

Sky reporter Cordelia Lynch said hospitals treating survivors have gone into overdrive.  

“Some have described this hospital as like a war zone and it is an overwhelming feeling,” she said.  

“It’s room after room full of the injured - some on floors, ohers in corridors, many with serious injuries.”