Metro: 'Heat Kink' Probable Derailment Cause

Green Line service suspended between Fort Totten, Prince George's Plaza

Saturday, Jul 7, 2012  |  Updated 7:59 PM EDT
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Darcy Spencer has the latest on a train derailment on Metro's green line in West Hyattsville Maryland

Darcy Spencer

Darcy Spencer has the latest on a train derailment on Metro's green line in West Hyattsville Maryland

Photos and Videos

Derailment's Effects Will Last Through Weekend

News4's Jackie Bensen reports on the effect Friday's derailment of a Green Line train will have throughout the Metro system
More Photos and Videos

Metro Investigators have determined that a so-called "heat kink" was the "probable cause" of a derailment that snarled mass transit during Friday's rush hour.

Three cars of a southbound Green Line train derailed at approximately 4:45 Friday afternoon as the train was entering a tunnel from an outdoor section of the tracks near the West Hyattsville station.

No injuries were reported as a result of the derailment, but 55 passengers were evacuated and a pregnant woman was taken to the hospital for observation.

"Heat kinks are short sections of misaligned track caused by the expansion of metal rails in extremely high temperatures and prolonged exposure to direct sunlight," Metro's statement explained. "When the expanding rail cannot be constrained by cross-ties and ballast, the rail may expand outward from the normal track alignment."

As a result of the derailment, all scheduled track work on Metro was canceled for the weekend, while trains operated on a speed limit of 35 miles per hour. Green Line service between Fort Totten and Prince George's Plaza remained suspended Saturday as crews worked to re-rail the cars and repair damaged track, third rail, and fasteners.

The "heat kink" in the tracks near West Hyattsville station. Photo Courtesy Metro.

 Below, video taken from inside the train. Courtesy: The Gazette

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