WMATA 8000 Series Rail Cars

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Re: RFP for 8000 series trains published

Postby Sand Box John » Wed Feb 22, 2017 9:55 am

Heated floors will produce an even distribution of heat through the car interior. As JDC point out it will aide in drying the floor more quickly. It will make it possible to configure the HVAC system to function as a air cooling system only as apposed being both a heating and cooling system.
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Re: RFP for 8000 series trains published

Postby MCL1981 » Wed Feb 22, 2017 11:14 am

I wonder if they could use the dynamic braking juice to electrically heat the floor? That would be kinda neat. It would be inconsistent and need to be supplemented if the train is parked for a long time.
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Re: RFP for 8000 series trains published

Postby JDC » Wed Feb 22, 2017 11:39 am

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Re: RFP for 8000 series trains published

Postby MCL1981 » Wed Feb 22, 2017 1:15 pm

Personally, I think they should just buy more 7000s while the getting is good. Buy enough to retire whatever is up for retirement in the next 10 years and be done with it.
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Re: RFP for 8000 series trains published

Postby mtuandrew » Wed Feb 22, 2017 4:40 pm

Immediate thoughts:

-I like the quad doors/side, anything to reduce the crush points.
-For the love of Wiedefeld, make the propulsion and HVAC systems reasonably compatible with the 7000s!
-Partial open gangways: yes. Doesn't matter whether the cars are married A-A pairs or A-B pairs. Maybe you could even rebuild the existing 7ks to 8k standard with open gangways once you start taking delivery of 8ks.
-Get some comfy chairs back!

And bring these in as you retire the 2-3ks AND the 5-6ks. The 6ks being the last to go, of course.
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Re: RFP for 8000 series trains published

Postby STrRedWolf » Wed Feb 22, 2017 7:27 pm

MCL1981 wrote:Personally, I think they should just buy more 7000s while the getting is good. Buy enough to retire whatever is up for retirement in the next 10 years and be done with it.


I have to agree. Get more 7k's to replace the 2k's and 3k's, rehab the 6k's, and really be far-looking on the 8k's.
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Re: RFP for 8000 series trains published

Postby mtuandrew » Wed Feb 22, 2017 11:23 pm

WMATA's 8000-series wish list sounds a lot like the MTA R211 specs, actually, but in a 15' longer body shell.

Do any of you think Metro will go back to 75mph ATO ops when the last legacy cars are off property?
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Re: WMATA 8000 Series Rail Cars

Postby davinp » Thu Feb 23, 2017 8:07 am

Article in today's Washington Post:
https://www.washingtonpost.com/news/dr- ... he-future/?

Metro will have to retire the 2000/3000 series cars before 2025, so they probably will need to buy more 7000 series in a few years.
We should not wait until they become unreliable to buy new cars.
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Re: RFP for 8000 series trains published

Postby wrivlin » Thu Feb 23, 2017 4:20 pm

mtuandrew wrote:Do any of you think Metro will go back to 75mph ATO ops when the last legacy cars are off property?

I sincerely hope so. Not that it would make a difference with all the speed restrictions in place everywhere.
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Re: RFP for 8000 series trains published

Postby Sand Box John » Thu Feb 23, 2017 9:47 pm

"mtuandrew"

Do any of you think Metro will go back to 75mph ATO ops when the last legacy cars are off property?


Based on what I know, probably not.

Two issues that will likely hold speeds below 75MPH for the foreseeable future:

  • Running trains at those higher speeds beat the crap out of the 1k car during their early years, WMATA likely doesn't want to do the same thing to the any of the rolling stock. That was the primary reason for reducing maximum speeds in the first place.
  • Traction power distribution system can not handle the necessary kilowatts to sustain the loads for those speeds.
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Re: WMATA 8000 Series Rail Cars

Postby YOLO » Thu Apr 20, 2017 7:02 pm

I really wish they would build trains with 4 doors instead of 3
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Re: WMATA 8000 Series Rail Cars

Postby Sand Box John » Thu Apr 20, 2017 8:58 pm

"YOLO"
I really wish they would build trains with 4 doors instead of 3


The idea of 4 doors per side was proposed when the specification for the 4k car procurement was being drawn up. The staff shot the idea down because of the added weight of the structural elements that would be necessary to allow for 4th door opening. The 7k cars are allegedly causing vibration issues because of their greater weight. The 7k cars are similar to the rest of WMATA's rolling stock in that they are of monocoque type construction. Adding a 4th door opening would require the cars to be heaver for the same reason. I will also note that latest generation of cars procured by NYCT are heaver then WMATA's 7k cars, are 15' shorter and have 4 doors per side. Some but not all of that weight is in the heaver trucks used under those cars.
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Re: WMATA 8000 Series Rail Cars

Postby mtuandrew » Fri Apr 21, 2017 5:24 pm

John: the latest Trains has a feature article on the Kawasaki efWING trucks. A claimed weight reduction of up to 40% over steel trucks would definitely entice me to consider Kawi for the 8ks!
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Re: WMATA 8000 Series Rail Cars

Postby Sand Box John » Fri Apr 21, 2017 7:32 pm

"mtuandrew"
John: the latest
Trains has a feature article on the Kawasaki efWING trucks. A claimed weight reduction of up to 40% over steel trucks would definitely entice me to consider Kawi for the 8ks!

I don't see WMATA adopting that truck design because the bearing journals are outboard and it employs tire brakes. WMATA choose the inboard frame trucks because of their lighter weight and disk brake rotors mounted on the axle ends. These might be suitable on NYCT as they use outboard frame trucks and tire brakes.
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Re: WMATA 8000 Series Rail Cars

Postby Chris Brown » Sat Apr 22, 2017 9:42 am

I don't agree with the idea that WMATA should just keep ordering 7k's to replace the 2k and 3k cars. I believe it is much smarter to make some design changes with the 8k cars. The reason for this comes down to having variety in the fleet.. which helps to avoid a situation where the entire fleet is compromised by some future defect identified.

Per example.. the 1k and 4K cars. After decades the 1k cars were discovered to not be crash worthy. Then later the 4k cars were taken out of service because of a defect. Then again moved to the center of trains because of another problem. This is why the entire fleet cannot be the same. You need variety for situations like this where defects are found down the road.
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