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1989 Helena train wreck
The Helena Train Wreck occurred in the early morning on February 2, 1989 in Helena, Montana, USA, when 48 cars of a Montana Rail Link freight train that had been decoupled from their locomotives by a train crew on Mullan Pass rolled backwards down the pass, traveling nine miles back into the city of Helena and colliding with a work train at a railway crossing near the center of the community. The collision resulted in a fire and explosion that damaged Carroll College and other nearby structures, knocked out power to most of the town, and led to the evacuation of residents within an area of due to concerns of possible toxic chemical release. The event occurred during a severe cold snap, with temperatures below that morning and with a wind chill factor of as much as , which froze the water that firefighters used to attempt to put out the fire.
==Event==
In the early morning of February 2, 1989, during a record cold snap,〔 a Montana Rail Link freight train picked up three extra "pusher" locomotives in Helena, Montana, to help move the train over Mullan Pass. The train then traveled west from Helena. Partway up the pass, the lead engine developed an electrical problem that caused a loss of power and at about the same time was stopped by a malfunctioning signal. The train crew then parked the train at the Austin siding, on the east side of Mullan Pass. While waiting for the signal to be fixed, the crew uncoupled the engines from the 48-car train to switch the order of the locomotives, setting the air brakes but not the hand brakes on the cars. At about 5:30 a.m., record cold temperatures caused the air brakes to fail on the decoupled cars.〔 The cars then rolled backwards downhill, uncontrolled, into Helena, crashed into a parked work train near the Benton Avenue crossing and Carroll College, caught fire, and exploded.〔(【引用サイトリンク】title=National Weather Service Unveils Montana's Top Ten Weather/Water/Climate Events of the 20th Century )〕
The explosion awakened many local residents, some of whom thought it was an earthquake. The blast caused extensive damage to Carroll College,〔 shaking St. Charles Hall, a classroom and dormitory building, and shattering most of the windows in Guadelupe Hall, the women's dormitory. A piece of a railroad car landed in the college library, unoccupied at the time due to the early hour of the day.〔 Other buildings damaged in Helena included the scagliola columns and other interior features of the Cathedral of St. Helena, located over away.〔(【引用サイトリンク】title=Cathedral of St. Helena, Helena, Montana )〕 No one was killed, but the explosion knocked out electric service to much of the community, as well as to some residents outside Helena, including rolling brownouts extending as far north as Great Falls, Montana, approximately away. It shattered windows distant, ejected debris for blocks, and raised concerns about toxic gases spreading through the community. Neighborhoods within a radius of were evacuated.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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