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| Sunday night on Twitter @wmata (1587932) | |
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Sunday night on Twitter @wmata |
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Posted by Joe on Sun Oct 17 20:59:27 2021 As of an hour ago, 7000-series cars will not be in service October 18, 2021. Check Twitter announcement. Due to Blue Line derailment in Arlington. |
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Re: Sunday night on Twitter @wmata |
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Posted by Sand Box John on Sun Oct 17 22:19:08 2021, in response to Sunday night on Twitter @wmata, posted by Joe on Sun Oct 17 20:59:27 2021. As of an hour ago, 7000-series cars will not be in service October 18, 2021. Check Twitter announcement. Due to Blue Line derailment in Arlington.For those that don't know. Just before 5:00 PM on 10 12 2021 Blue line train 704 heading in direction of Franconia Springfield derailed south of the Rosslyn Station a couple of hundred short of exiting the tunnel portal. The trains consist was 7k cars. Blue line service was operated between Franconia Springfield and Mount Vernon Square and Orange and Silver line train were single tracked between Foggy Bottom and Court House on 10 12, 13 2021 to conduct an investigation, remove the derailed cars and make track repairs. Goggle search WMATA Blue line derailment 10 12 2021 John in the sand box of Maryland's eastern shore. |
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Re: Sunday night on Twitter @wmata |
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Posted by Steamdriven on Mon Oct 18 00:43:39 2021, in response to Re: Sunday night on Twitter @wmata, posted by Sand Box John on Sun Oct 17 22:19:08 2021. So stuff happens on the 12th, and WMATA tells their ridership 'sorry 'bout your train to work, maybe you should walk' on the 17th?Maybe they should convert the tunnels into bike lanes be done with it. |
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(Sponsored) |
iPhone 6 (4.7 Inch) Premium PU Leather Wallet Case - Red w/ Floral Interior - by Notch-It |
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Re: Sunday night on Twitter @wmata |
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Posted by Joe V on Mon Oct 18 09:57:00 2021, in response to Re: Sunday night on Twitter @wmata, posted by Steamdriven on Mon Oct 18 00:43:39 2021. That leaves just the 2000's, 3000's and 16 of the 6000's in service. Too bad they scrapped the 5000's. |
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Re: Sunday night on Twitter @wmata |
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Posted by Sand Box John on Mon Oct 18 13:17:04 2021, in response to Re: Sunday night on Twitter @wmata, posted by Joe V on Mon Oct 18 09:57:00 2021. That leaves just the 2000's, 3000's and 16 of the 6000's in service. Too bad they scrapped the 5000's.My understanding is all 180 of the 6k cars have been returned to service. Seems the NTSB has discovered that the wheels on the axles were slipping out of gauge (wide) ‘This could have been catastrophic’: NTSB says Metro wheel problem that caused Blue Line derailment dates back to 2017. Jack Moore WTOP FM 103.5 FM 10 18 2021 11:16 EDT Sounds to me like the interference fit of the wheels to axle was greater then spec. John in the sand box of Maryland's eastern shore. |
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Re: Sunday night on Twitter @wmata |
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Posted by Sand Box John on Tue Oct 19 09:58:35 2021, in response to Sunday night on Twitter @wmata, posted by Joe on Sun Oct 17 20:59:27 2021. Here is the deal with the 7k cars.Multiple cars are have had issues with the wheels on the wheel sets slipping out of gauge (wider then correct gauge). The derailment on 10 12 2021 was caused by one of the flanges on the out of gauge wheel sets picking the point of the frog in junction turnout south of the Rosslyn Station. NTSB WMATA Metrorail Derailment Media Briefing starting at 22:07 This is sounding like an issue with the assembly of the wheel sets. Seems like the vendor that made the wheel sets for Kawasaki were fitting wheels to the axles that had interference fits that were out of tolerance. Either the inside diameter of the wheel bore was to big or the outside diameter of the axle was to small or combination of both. It could also be that the interference fit tolerances used were not correct in the first place. The tolerance used in interference fits are measured in ten thousands of an inch or one hundreds of mileometer. The temperature of two parts being interference fitted must be same when the measurements are made. John in the sand box of Maryland's eastern shore. |
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Re: Sunday night on Twitter @wmata |
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Posted by Joe V on Tue Oct 19 10:13:08 2021, in response to Re: Sunday night on Twitter @wmata, posted by Sand Box John on Tue Oct 19 09:58:35 2021. How long do wheels last for wear on WMATA cars ? |
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Re: Sunday night on Twitter @wmata |
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Posted by Sand Box John on Tue Oct 19 19:34:14 2021, in response to Re: Sunday night on Twitter @wmata, posted by Joe V on Tue Oct 19 10:13:08 2021. How long do wheels last for wear on WMATA cars ?I don't know the number of miles they run before replacing them after several times of re-truing the wheel profile. New wheels are 28". They sure as hell don't slip out of gauge before wearing down to the minimum diameter. John in the sand box of Maryland's eastern shore. |
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Re: Sunday night on Twitter @wmata |
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Posted by TransitChuckG on Wed Oct 20 05:06:43 2021, in response to Re: Sunday night on Twitter @wmata, posted by Sand Box John on Mon Oct 18 13:17:04 2021. Sounds to me like the interference fit of the wheels to axle was greater than spec.From my limited knowledge of mechanical engineering, I would agree. Thanks, Sand Box John |
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Re: Sunday night on Twitter @wmata |
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Posted by TransitChuckG on Wed Oct 20 10:26:56 2021, in response to Re: Sunday night on Twitter @wmata, posted by Sand Box John on Tue Oct 19 09:58:35 2021. Thanks for the video! Sand Box John |
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