I got to the derailment site a couple hours after it happened and snapped a bunch of photos over the next several days. I'm not an investigator or railroad employee. But I watch lots of TV, so I like to pretend. I agree with Mike's opinion as to the cause likely being broken rail, but I wonder if will we ever hear the official cause? Below are my unofficial observations and/or opinions.
http://johnhill_3009.rrpicturearchives. ... x?id=58126On June 30, eastbound BNSF coal loads C-WTMSUH0-02 (Wyoming to Superior WI) derailed 17 cars somewhere in the middle of the train while accelerating from the passing siding onto the mainline through the trailing-point East Wayzata siding switch. DPU BNSF 9367 was pushing on the rear. Although the mainline is ribbonrail, the siding is jointed "non-bonded" rail with a speed limit about 25 MPH. I assume the train was traveling within that speed limit.
I believe the derailment started several hundred feet prior to reaching the East Wayzata switch. The first 5 derailed cars uncoupled from the rear of the train, staying upright and coupled as the front of the train continued pulling forward with emergency brakes beginning to set. The 4th and 5th derailed cars quickly uncoupled from the front and stopped upright as the front of the train continued dragging the other 3 upright derailed cars before coming to a complete stop. Several hundred feet of siding trackage were literally destroyed between the front and rear sections of the train. The 6th derailed car on the rear half of the train somehow dug in hard and stopped near the initial derailment location, triggering an "accordion" pileup of 12 trailing cars before the rear of the train came to a stop in emergency braking.
The pileup damaged and blocked the mainline as well as the passing siding and at least one of the former GN "Hutch" interchange yard tracks. No derailed cars reached the East Wayzata siding switch and the remaining siding trackage out to the West Wayzata switch also was undamaged.
John