Maharashtra Rail Accident: Spark from hot axle or rumour, what was the real reason?

12 passengers died in a horrific train accident in Jalgaon, Maharashtra. Rumors of fire spread in the Pushpak Express going from Lucknow to Mumbai, after which the passengers got down on another track. During this time Karnataka Express crushed him. Initial investigation suspects sparks from hot axle or false rumour. The railway administration has sent ambulances and accident relief trains to help the injured. This incident has raised serious questions on railway safety and rumor control.