Officials earlier reported that the track circuit had been repaired June 17, five days before the crash.
CNN: NTSB says train detection system failed in days before D.C. crash
The NTSB says it is now reviewing documentation on the performance of the track circuit both before and after the June 17 repair.
CNN: NTSB says train detection system failed in days before D.C. crash
According to the NTSB, which is investigating the crash, maintenance records show that an "impedance bond" for the track circuit where the accident occurred was replaced June 17.
CNN: NTSB says train detection system failed in days before D.C. crash
For those who want to wear in the hiking boots, the 39 km Tabletop Track circuit takes three to five days to complete, making it ideal for long weekend jaunts from Darwin.
The NTSB says the Washington Metropolitan Area Transit Authority reported the problem during a post-accident review of track circuit data, but it was not immediately clear if operators were aware of the problem before the accident.
CNN: NTSB says train detection system failed in days before D.C. crash
The figure is a measure of circuit track density and broadly relates to processing power and energy consumption.
The owner of the host track, Bahrain International Circuit, said that the race should be trouble-free.
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The owner of the host track, Bahrain International Circuit, said that the race should be trouble-free, although an opposition group has called for a week of demonstrations ahead of the event.
The Bahraini government not only owns the Sakhir track, but it also invested millions to build the circuit before the first race there in 2004.
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Overnight changes to the Yeongam circuit focused on the kerbs, but the track itself was initially almost as dusty as it had been before first practice on Friday.
By rights, the F12 shouldn't be able to do what Ferrari says it can do, which is to lap the Fiorano circuit, the company's time-honored reference track, in 1:23.
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Mr. Kumar: We provide connectivity for the 20 race locations around the world, and that enables both F1 and some of the race teams to optimize and fully leverage the data that's being collected from the track and the races to improve the performance of cars on the circuit.
The second session was initially stopped after Force India's Tonio Liuzzi careered of the track because of aquaplaning caused by the huge volume of water on the circuit.
At the Miramar Speed Circuit in San Diego, grown men zip around a quarter mile track in miniature racing carts.
The Montreal track was breaking up so badly that marshalls emerged with brushes to sweep up the circuit, and similar conditions could play a part during the race.
Switching my focus to the action this weekend, I am told the facilities are superb at Motorland but the track is in the middle of nowhere, so it seems an odd place to build a circuit.
Originally scheduled for April 24 at the Twin Ring Motegi circuit, the BBC reported that roads leading to Tokyo required repair and sections of the track were cracked in the earth quake.
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The track itself is a sequence of closely packed rectangular metal frames, each of which can act as an independent electrical circuit.
The Velodrome cycling track will be converted into VeloPark, which, with the addition of a mountain bike course and road-cycle circuit, will be open for community and club sports.
From a pre-race downpour of rain on the Interlagos circuit in Sao Paulo, to the early exit of veteran David Coulthard and the effects of a drying track -- this race had it all.
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