Back Bay Station Air Quality-Electrics the answer?

Discussion relating to commuter rail, light rail, and subway operations of the MBTA.

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Re: Back Bay Station Air Quality-Electrics the answer?

Postby charlesriverbranch » Wed Jan 24, 2018 11:34 am

I still think the commuter rail of the future will be battery-powered. With today's technology, I suspect a battery-powered MU trainset could be built to handle of the MBTA's routes.
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Re: Back Bay Station Air Quality-Electrics the answer?

Postby rethcir » Wed Jan 24, 2018 1:23 pm

Getting OT, but hydrogen fuel cell would work great in this application. Typically FCV's have a generator powring electric motors, so you'd have the stop/start ability, but could run clean* fuel for long hauls. I suppose there could be a risk carrying compressed hyrdogen fuel into tunnels, etc though.

*depending on generation/distribution, etc
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Re: Back Bay Station Air Quality-Electrics the answer?

Postby CRail » Wed Jan 24, 2018 2:32 pm

charlesriverbranch wrote:With today's technology, I suspect a battery-powered MU trainset could be built to handle of the MBTA's routes.

Today's technology can't successfully get a bus through a day's service without issues. Hybrid technology hasn't even been instituted on trains yet despite them having been electric drive for 70+ years, let alone battery power without a fuel source. I'm not saying we'll never get there, but certainly not with today's technology.
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Re: Back Bay Station Air Quality-Electrics the answer?

Postby MBTA3247 » Wed Jan 24, 2018 3:46 pm

CRail wrote:Hybrid technology hasn't even been instituted on trains yet despite them having been electric drive for 70+ years, let alone battery power without a fuel source.

Yes, it has, though not in road-switcher form.
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Re: Back Bay Station Air Quality-Electrics the answer?

Postby BostonUrbEx » Wed Jan 24, 2018 5:40 pm

Nice to see progress, but that engine has a top speed of 60mph and a tractive maximum of 2,000 horsepower, and still relies on a diesel engine on top of the battery. The MBTA needs engines capable of at least 79mph and greater than 3,000hp tractive effort (more like 4,000hp).
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Re: Back Bay Station Air Quality-Electrics the answer?

Postby millerm277 » Thu Jan 25, 2018 1:37 am

As a bit of a note on this whole topic, while the station ventilation system may be inadequate even if it was working correctly, the reason things are so bad is just utter neglect, to a degree I find astounding.

Almost the entire ventilation system is broken or other otherwise non-functional. This MassDOT presentation: http://www.bostonplans.org/getattachmen ... 4ddcc7f931 lays out exactly how broken it was allowed to become.
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Re: Back Bay Station Air Quality-Electrics the answer?

Postby typesix » Thu Jan 25, 2018 1:33 pm

BostonUrbEx wrote:.... greater than 3,000hp tractive effort (more like 4,000hp).


Tractive effort is not the same as horsepower.
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Re: Back Bay Station Air Quality-Electrics the answer?

Postby BostonUrbEx » Thu Jan 25, 2018 5:26 pm

My apologies. However you would phrase horsepower dedicated to producing traction, then. For example, the HSP-46's have engines along the lines of 4,600hp, but about 600 of which goes towards providing HEP.
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Re: Back Bay Station Air Quality-Electrics the answer?

Postby BandA » Thu Jan 25, 2018 9:29 pm

I'm shocked that the ventilation system has not been maintained. What is wrong with these people?

[OT] the linked presentation doesn't show any provision for fare gates for Commuter Rail.
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Re: Back Bay Station Air Quality-Electrics the answer?

Postby Trainman101 » Thu Jan 25, 2018 9:55 pm

The smoke is actually nice it hides some of the urine smell down there.
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Re: Back Bay Station Air Quality-Electrics the answer?

Postby typesix » Thu Jan 25, 2018 10:30 pm

BostonUrbEx wrote:My apologies. However you would phrase horsepower dedicated to producing traction, then. For example, the HSP-46's have engines along the lines of 4,600hp, but about 600 of which goes towards providing HEP.


What you stated is one way I have seen. Alternately, have seen: 4,600 HP of which 4000 is available for traction. Tractive effort is usually more talked about for freight trains and is rated in thousands of pounds of force required to overcome train resistance.
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