He said initial investigations showed the "catch-point" system automatically derailed the train to prevent it progressing further.
Buses were running between Inverness and Aviemore to replace rail services because a derailed freight train continued to block the track.
The finding by the safety board isn't a definitive determination of the cause of last week's accident, in which one Metro-North train derailed and was then sideswiped by another train, injuring more than 70 people.
WSJ: Probe of Metro-North Derailment in Connecticut Focuses on Rail
One eastbound train derailed, coming to rest in the path of a westbound train that sideswiped it, damaging several cars and tearing up rails.
Using interviews, inspections of wreckage and reviews of maintenance data, NTSB investigators have determined that the first, eastbound Metro-North train derailed and came to a stop in the path of an approaching westbound train.
WSJ: Probe of Metro-North Derailment in Connecticut Focuses on Rail
An 84-year-old woman died in February's Cumbria crash when a London to Glasgow Virgin Pendolino train derailed.
The train derailed near Regent Road as empty carriages were being moved from Ardwick to Carnforth in Lancashire.
BBC: Salford rail delays after train derailed and caught fire
In 2004 a train derailed there, killing seven, and in May a man on a moped died on the level crossing.
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Rail services hit by delays after a train derailed and caught fire in Salford have returned to normal, Northern Rail said.
After a wet April, a deluge in mid-May washed out gravel supporting the rails, and 15 cars on a Burlington Northern Santa Fe coal train derailed.
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The last two cars of the stalled train derailed.
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In a statement issued Friday, the NTSB said the engineer of the eastbound train that derailed told investigators he noticed "an unusual condition on the track" as the train approached the area of the derailment in Bridgeport, Conn.
WSJ: Probe of Metro-North Derailment in Connecticut Focuses on Rail
Seventy-two people were sent to the hospital Friday evening after a Metro-North train heading east from New York City derailed and was hit by a train heading west from New Haven.
Some cars on the second train also derailed as a result of the collision.
The court heard the 115 mph crash took place when the train was derailed by a cracked section of the track.
"This was not because of any lack of integrity of the bridge in southeast Missouri, but because of a train that derailed and had a bunch of rail cars slamming around, " he said.
British Transport Police (BTP) said no train passengers were hurt and the train was not derailed.
BBC: Train hits car on Great Coates level crossing killing two
Reports say more than 1, 300 passengers were aboard the train when it derailed shortly after midnight.
The welfare lobby, bureaucrats, and other recipients of taxpayer largesse are becoming increasingly agitated that their gravy train may be derailed.
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My view was that the train had already derailed before it left the station, and the challenge was for IRS to get it back on track.
In the second incident, a freight train, including chemical wagons, derailed south of Northampton at 0130GMT.
The inter-city train from Warsaw to Katowice was derailed at the town of Baby, near the city of Piotrkow Trybunalski, emergency services said.
The accident occurred when a train heading from New York City to New Haven derailed around 6:10 p.m.
The accident occurred when a train heading from New Haven to New York City derailed around 6:10 p.m.
No train passengers were hurt and the service was not derailed during the crash, which happened at about 19:40 BST.
The eastbound train, headed to New Haven from Grand Central Terminal, derailed at about 6:10 p.m. just east of the Fairfield Metro station, and hit a westbound train on the opposite track, Metro-North spokeswoman Marjorie Anders said, knocking several cars of that train off the rails.
An Arriva Wales Train service from Rhymney to Barry has hit a tree and partially derailed near Bargoed.
The train carrying Central Security conscripts was heading from Assiut north to Cairo when it partially derailed around 12:45 a.m.
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