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Investigators find derailment point, broken axle

Workers inspect an oil car Wednesday near Casselton, N.D. The tanker was one of those not destroyed during the two-train accident that occurred Monday afternoon when a westbound grain train derailed crossing the tracks of an eastbound train carry crude oil. (DARRIN GIBBINS/THE FORUM)

CASSELTON, N.D. — Investigators of Monday’s train collision and fire have determined the point of the derailment and say a broken axle will be studied to determine if it played a role.

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About 2:10 p.m. Monday, an eastbound Burlington Northern Santa Fe train hauling crude oil struck a westbound train’s derailed car filled with soybeans.

The crash, about a half mile west of Casselton, set off massive explosions and prompted evacuations of the town and some of the surrounding area due to concerns about toxic clouds of smoke billowing from burning oil.

Among the National Transportation Safety Board findings released Wednesday:

* The track on which the westbound grain train was traveling was inspected by a “high rail” vehicle and by inspectors on foot.

Sumwalt said inspectors found physical evidence of the point of the derailment at a mechanical switch in the rail.

* Investigators looked at data logs for signal equipment on both sides of the tracks three to five miles from the site of the collision. No problems were found with the signals.

* Data recorders in the grain train’s locomotives indicate it was going 28 mph when its cars began to derail. At that time, emergency braking went into effect, Sumwalt said.

The eastbound train carrying oil had two event recorders in the two lead locomotives, but Sumwalt said investigators have not been able to get into the locomotives and are not optimistic that any data will be recoverable.

However, he said investigators have been able to pull data from a third locomotive on the end of the oil train. That event recorder estimated the train’s speed at 42 mph.

* There may have been less than a minute between the derailment of the grain train’s cars and the collision of the oil tanker train with one of those cars. That crash led to at least 18 cars from the oil train derailing, setting several tanker cars ablaze and causing huge explosions.

* The signals around the crash site were in good working order.

* The oil train’s cargo was supposed to be UN1267 petroleum crude oil. It is a Class 3 flammable liquid. And it was supposed to be packing group 1, which is supposed to have the lowest flash point.

Investigators will check the shipping records to be sure the oil was properly classified, Sumwalt said.

* All of the tanker cars have been moved and placed at a point near the tracks where they can be more thoroughly examined by inspectors.

That will also allow the transfer or remaining oil in the tank cars into trucks waiting at the site.

“We’re making good progress,” Sumwalt said.

Sumwalt said NTSB investigative teams will be at the site through the weekend.

At the site of the derailment, more than a dozen flatbed trucks were pulled to the side. Some of them had brought into backhoes and front-end loaders, while others waited to haul off damaged rail stock.

One tanker car sat on a the tracks, and a group of inspectors walked around it Wednesday afternoon.

Perhaps a hundred yards to the east, two grain hopper cars also stood on the tracks.

The wreckage had stopped burning and only one car, away from the rest, appeared to still be smoking.