TRANSPORTATION: PUBLIC URBAN AND PASSENGER: Source: Metro Circuits Were Malfunctioning for Five Days

classic Classic list List threaded Threaded
1 message Options
Reply | Threaded
Open this post in threaded view
|  
Report Content as Inappropriate

TRANSPORTATION: PUBLIC URBAN AND PASSENGER: Source: Metro Circuits Were Malfunctioning for Five Days

David P. Dillard
Administrator


.


TRANSPORTATION: PUBLIC URBAN AND PASSENGER:
Source: Metro Circuits Were Malfunctioning for Five Days




Source: Metro Circuits Were Malfunctioning for Five Days
Originally published June 26, 2009
By Marge Neal
News-Post Staff
The Frederick News-Post
<http://www.fredericknewspost.com/sections/
news/display.htm?storyID=91910>


A shorter URL for the above link:


<http://tinyurl.com/kkx6rd>


Two track circuits in the area of Monday's deadly Metro crash alternately
reported the track as vacant and then occupied almost constantly from June
17, when a part of a signaling device was replaced, until the time of the
crash, according to a Metro source.
The circuits appeared to have intermittently lost track of the trains
involved in the crash of two Metro trains that killed nine people,
according to Metro documents obtained by The Frederick News-Post.

The documents show what is known as "flip-flopping," with the circuit
alternately reporting the track as "occupied" and then "vacant." The
report for track circuit number B2-304, where the stopped train was
located, starts at 4:45 p.m. and ends at 5:38 p.m., about 40 minutes after
the crash.

Throughout the time period covered by the report, the circuit shows the
track either occupied or vacant as often as every couple of seconds.

At 4:57:03 p.m., about the time of the crash, the report shows the track
to be vacant until 5:37:44, when it reports the track is occupied. Less
than a minute later, the report again states the track was vacant, even
though train wreckage was on the track. One second after that, the track
was reportedly occupied again. The circuit flip-flopped again before
finally showing the track to be occupied at 5:38:40.


<snip>


The operator of the striking train, Jeanice McMillan, was killed in the
impact. NTSB investigators found metal-to-metal compression streak marks
on both rails of the track for about 125 feet ending near the point of
impact, consistent with heavy braking, the release states.

McMillan apparently pressed a "mushroom" button to activate an emergency
brake.



----------------------------------------------------




The complete article may be read at the URL above.



Sincerely,
David Dillard
Temple University
(215) 204 - 4584
[hidden email]
<http://daviddillard.businesscard2.com>
Net-Gold
<http://groups.yahoo.com/group/net-gold>
<http://listserv.temple.edu/archives/net-gold.html>
<http://groups.google.com/group/net-gold?hl=en>
<http://net-gold.jiglu.com/>
General Internet & Print Resources
<http://guides.temple.edu/general-internet>
COUNTRIES
<http://guides.temple.edu/general-country-info>
EMPLOYMENT
<http://guides.temple.edu/EMPLOYMENT>
TOURISM
<http://guides.temple.edu/tourism>
DISABILITIES
<http://guides.temple.edu/DISABILITIES>
Educator-Gold
<http://groups.yahoo.com/group/Educator-Gold/>
K12ADMINLIFE
<http://groups.yahoo.com/group/K12AdminLIFE/>
Nina Dillard's Photographs on Net-Gold
Twitter: davidpdillard



Bushell, R. & Sheldon, P. (eds),
Wellness and Tourism: Mind, Body, Spirit,
Place, New York: Cognizant Communication Books.
Wellness Tourism: Bibliographic and Webliographic Essay
David P. Dillard
<http://tinyurl.com/p63whl>
<http://tinyurl.com/ou53aw>



INDOOR GARDENING

Improve Your Chances for Indoor Gardening Success

http://tech.groups.yahoo.com/group/IndoorGardeningUrban/

http://groups.google.com/group/indoor-gardening-and-urban-gardening

http://indoorgardening.jiglu.com/


Loading...