Fault in tracks was the possible cause of derailment of the Delhi-Kamakhya North East Express in Bihar in which four people were killed and several injured, sources said on Thursday citing a preliminary investigation report.

The report, signed by six railway officials including the driver of the ill-fated train, stated, “It seems that derailment occurred due to fault in tracks.”

It estimated the cost of damage due to the accident at more than ₹52 crore.

The loco pilot was partially injured and his assistant suffered serious injuries in the accident Wednesday night.

The report also contained a statement by the loco pilot who said that the train passed Raghunathpur station, near which the accident occurred, at a speed of 128 km per hour, but soon after it crossed the station section it suffered a severe jolt at the rear end with excessive vibration.

As a result of the excessive vibration and the severe jolt, the brake pipe pressure dropped suddenly and the train derailed at 9:52 pm, the preliminary report quoted the loco pilot as saying.