What happened in Mumbai Elphinstone station tragedy?

On September 29 morning it started to rain heavily in Mumbai and many crowded to get some shelter from the unexpected downpour by climbing the narrow foot over bridge (FOB) in Elphinstone Road station resulting in an increasingly uncontrollable rush which led to crowding which killed 22 commuters and injured 39, including an 11-year-old boy.
Survivors of the stampede are blaming the unexpected rain. With little or no rainfall in the past week, and the city almost back to its normal humidity, most had stopped carrying umbrellas, and were understandably reluctant to step out from the shelter the FOB’s roof offered.
Rajesh Dere, acting Head of Department (Forensics), KEM Hospital where the dead and injured were shifted said, “Most of the deceased had suffered from chest compression and haemorrhage due to injuries. A few may have suffered from suffocation or neurogenic shock due to reduced oxygen supply.
One of the survivors recounted the experience with horror. “There wasn’t an inch of room. I was close to the railing, and as the pressure increased, I was pushed very hard against the rods. Within minutes, the crowd became uncontrollable and everyone began falling on each other. The last I remember, several people fell on me.”