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Passenger Trains > DC:"Metro tracks might be contributing to wheel safety issue"


Date: 09/20/22 22:23
DC:"Metro tracks might be contributing to wheel safety issue"
Author: Lurch_in_ABQ

Metro tracks might be contributing to 7000-series safety issue - The Washington Post
   
"Wheel problems similar to those that sidelined about half of Metro’s rail car fleet also occurred years earlier on older cars, partly stemming from a track issue Metro never addressed, the transit system’s regulatory agency said Tuesday while citing a years-old report that recently came to light...."
     
"....safety commission spokesman Max Smith said the track issues don’t pose a new threat to riders. He called the issue with the restraining rail 
 located in track switches or turnouts that help trains maneuver on curves — one part of what could be causing wheel movements...."



Date: 09/21/22 10:04
Re: DC:"Metro tracks might be contributing to wheel safety issue"
Author: joemvcnj

How come this time it only affected the 7K, not the older cars ? 



Date: 09/21/22 11:04
Re: DC:"Metro tracks might be contributing to wheel safety issue"
Author: TAW

joemvcnj Wrote:
-------------------------------------------------------
> How come this time it only affected the 7K, not
> the older cars ? 

It might be a matter of the wheel profile used in those cars. They may not be consistent with the profile of the rail. At least, that's the first thing that comes to mind. It might also be truck design, such as the problem that the Amtrak MHCs had.

TAW



Date: 09/22/22 11:43
Re: DC:"Metro tracks might be contributing to wheel safety issue"
Author: mp208

It sounds like the guard  restraining) rails were installed TOO wide, and thus forcibly spread the wheels on the axle when going through the protected frog, without causing a derailment USUALLY.



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