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Seattle First Hill Streetcars out of service


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#1 CHamilton

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Posted 11 March 2017 - 12:15 PM

2½-block skid has Seattle scrutinizing streetcar safety
Originally published March 11, 2017 at 7:00 am Updated March 11, 2017 at 2:01 am
 
A train skidded last week on the First Hill line — a risk the city must address there, and on the future First Avenue streetcar near crowds of pedestrians, to open in 2020.
 
The momentary loss of power from a low-voltage battery was enough to send a Seattle streetcar skidding down Broadway on its rails for 2½ blocks, a safety hazard that technicians are still trying to cure several days later.
 
Though nobody was injured, the incident March 1 disabled four kinds of braking methods on the streetcar — and explains why city transportation chief Scott Kubly, citing an abundance of caution, is keeping the entire First Hill line closed.

 

 

http://www.seattleti...reetcar-safety/


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#2 CHamilton

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Posted 23 March 2017 - 11:58 AM

The First Hill Streetcars have been operating again since Monday. Here's a report on what happened.

https://sccinsight.c...ure-next-steps/


Amtrak can be better! Tell your local, state and national elected officials to support a more robust rail system. Join NARP and your local rail advocacy organization.
Where you'll find my posts: // All Aboard Washington (websiteFacebook) // Amtrak Unlimited Forum Group (Facebook) // Grow Trains (websiteFacebook, Twitter) // Restore the Pioneer Train (website, Facebook, Twitter) // Save the Seattle Waterfront Streetcar (Again) (websiteFacebook, Twitter) // Transit Riders of Puget Sound (Facebook) // Trains on FB (Facebook) // My Random Twitter Musings @HamiltonChas

#3 Devil's Advocate

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Posted 23 March 2017 - 12:05 PM

The problem with relays is that they are mechanical systems with moving parts, and moving parts all eventually fail. The streetcar had one of these controlling the braking systems, and it failed. That’s not unusual; what is unusual is that it exposed a major design flaw in the streetcar: all of the braking systems were controlled by the same load contactor. That’s called a “single point of failure” and it’s a big no-no in electrical systems design — especially critical systems like brakes.

 

That's not just dumb, that's DC-10-10 levels of stupidity.


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