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More on the Washington DC Metro Crash

Los Angeles Transit Officials Worried About Computer Problems Surfacing

2 min read

More on the Washington DC Metro Crash

Last night, the National Transportation Safety Board (NTSB) released more information about their investigation into this week's fatal Metro crash. The NTSB said that:

"Investigators found metal to metal compression streak marks  on both rails of the track for about 125 feet ending near the approximate point of impact, consistent with heavy braking.

Investigators conducted tests at the accident site last night with a similar train and found that when the train was  stopped at the same location as the stopped struck train, the train control system lost detection of the test train.

Investigators have collected recorder data from the struck train. Data was recovered from eight of the nine recorders on the struck train. Data could not be downloaded from one recorder. Two of the eight recorders did not contain data related to the accident; data collection ended before the accident for undetermined reasons.

The operator of the struck train was interviewed earlier today. He said that he operated his train in manual mode during his entire shift that afternoon. He said that he saw a train in front of him and stopped to wait for the train to clear. While stopped, he said that he felt a hard push from behind."

In this morning's Washington Post story on the crash, it stated that:

"If a malfunctioning circuit failed to detect the stopped train, it would have assumed that the stretch of track in front of McMillan's [the operator - ed.] train was clear and set the speed of her train at 59 mph, sending it hurtling into the stopped one."

The Metro board is not happy that the NTSB is releasing facts about the crash. The Post quotes Metro board chairman Jim Graham, who is a Washington DC politician, as saying:

" 'I believe it is very important to gather and determine the facts first and at an appropriate time release the facts," instead of "putting out piecemeal information, theories and possibilities" about the crash."

Well, he may be unhappy, but probably not as unhappy as transit officials in Los Angeles are right about now. It seems that major parts of the Los Angeles County Metropolitan Transportation Authority subway system use the same computer control system as the Metro. I suspect that they will be testing their rail sensors immediately.

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