Acela Speeds

Discussion related to Amtrak also known as the National Railroad Passenger Corp.

Moderators: GirlOnTheTrain, Amtrak67 of America, Tadman, gprimr1

Post Reply
Jersey_Mike
Posts: 4689
Joined: Wed Mar 17, 2004 1:39 am
Location: CHARLES aka B&P JCT MP 95.9
Contact:

Re: Acela Express 165mph testing in NJ September 2012

Post by Jersey_Mike » Fri Aug 03, 2012 6:14 am

Maybe they'll learn that they won't actually have to install new catenary because old school engineers actually knew what they were doing. Oh wait, its Federal money so who cares if its actually needed or not.

Matt Johnson
Posts: 4153
Joined: Mon Feb 18, 2008 3:57 pm
Location: Hazlet, NJ

Re: Acela Express 165mph testing in NJ September 2012

Post by Matt Johnson » Fri Aug 03, 2012 9:08 am

I think it's well established that new catenary is needed there. That being said, it'll be interesting to see whether they do bump revenue speeds at all prior to completion of the new constant tension catenary.

ericr
Posts: 72
Joined: Thu Jul 24, 2008 8:54 pm
Location: New Brunswick, NJ

Re: Acela Express 165mph testing in NJ September 2012

Post by ericr » Fri Aug 03, 2012 12:38 pm

Would this speed increase/new catenary have any effect on the Millstone Substation? I thought it still wasn't at 100% and there were speed restrictions because of that.

F-line to Dudley via Park
Posts: 7355
Joined: Fri Mar 11, 2005 7:26 pm
Location: North Cambridge

Re: Acela Express 165mph testing in NJ September 2012

Post by F-line to Dudley via Park » Fri Aug 03, 2012 1:34 pm

NRGeep wrote:I wonder if they have plans to eventually increase the Mansfield Ma area (presently 150mph) to 165mph?


Not planned yet, but they might be able to do it after they tri-track Mansfield station. The NEC is straight as a board from East Junction, Attleboro to the very slight curve at East St., Foxbororough. And that curve can probably get taken at full speed. It doesn't do any kind of curving that would require slowdown until S. Main St., Sharon about a half-mile south of that station. About 15 miles of total straightaway.

Commuter rail interference makes that kind of difficult to pull off. Yes, if the track were clear you could run that fast...but there are enough bottlenecks that dispatching >150 through that congestion becomes a futile effort. If the T would only isolate its new 93 MPH-rated locomotive and bi-level coach orders to the Providence Line so they could run commuter rail at Class 5 speed, I don't see why this stretch couldn't do 165 after the Mansfield center passing track is installed.

morris&essex4ever
Posts: 2012
Joined: Fri Apr 02, 2010 10:11 pm
Location: MP 20.5

Re: Acela Express 165mph testing in NJ September 2012

Post by morris&essex4ever » Fri Aug 03, 2012 3:22 pm

What's the maximum speed the PRR catenary can handle?
"To cure the British disease with socialism was like trying to cure leukaemia with leeches." Margaret Thatcher

CSX Conductor
Posts: 5458
Joined: Fri Mar 12, 2004 12:04 am
Location: Boston, Mass
Contact:

Re: Acela Express 165mph testing in NJ September 2012

Post by CSX Conductor » Fri Aug 03, 2012 4:09 pm

NRGeep wrote:I wonder if they have plans to eventually increase the Mansfield Ma area (presently 150mph) to 165mph?

It would make sense as this is the longest straightaway on the entire NEC.

NJTSmurf
Posts: 28
Joined: Tue Jul 20, 2010 2:47 pm

Re: Acela Express 165mph testing in NJ September 2012

Post by NJTSmurf » Fri Aug 03, 2012 6:06 pm

morris&essex4ever wrote:What's the maximum speed the PRR catenary can handle?


My understanding has always been that the MAS through Jersey for Acela is 135mph. How that was arrived at or determined, I can't say.
Long time RR.net lurker!

25Hz
Posts: 4625
Joined: Thu Oct 13, 2011 4:06 pm
Location: Newtown, PA (or PATH towards WTC)
Contact:

Re: Acela Express 165mph testing in NJ September 2012

Post by 25Hz » Fri Aug 03, 2012 9:28 pm

The lines are too of low tension for regular speeds over 140 mph.

If you ran such a test train as an hourly service eventually the lines would bounce free of their braces & get pulled down in spectacular fashion.

Constant tension is the key.

The cat pole foundations might need some work where the ground is more unstable, and they may need to plant a few more guys parallel to the ROW, but it's certainly feasable to go I'd say in the neighborhood of 175 safely after that work is done. The acela is only designed for 165 max, however a next gen acela could in theory go faster through that stretch without much additional modifications. You may end up having to boost the voltage to 15kv if you don't want localized drain spots when other trains pass nearby.
Next stop the square, journal square station next!

R36 Combine Coach
Posts: 5386
Joined: Mon Jun 09, 2008 8:51 pm

Re: Acela Express 165mph testing in NJ September 2012

Post by R36 Combine Coach » Fri Aug 03, 2012 10:11 pm

Is constant tension used in the rest of the world (Europe, Eastern Asia/Far East) where speeds are rated at 186 or higher?
Since my friend continues to chain smoke nonstop, she is probably an Alco.

dt_rt40
Posts: 221
Joined: Sat Jan 13, 2007 11:45 am
Location: MD

Re: Acela Express 165mph testing in NJ September 2012

Post by dt_rt40 » Fri Aug 03, 2012 10:32 pm

R36 Combine Coach wrote:Is constant tension used in the rest of the world (Europe, Eastern Asia/Far East) where speeds are rated at 186 or higher?


Yes, and on some slower lines. Even on a relatively "podunk" line like the one from Zaragoza to San Sebastian, Spain, one sees the characteristic weights and pulleys of CT catenary.

Matt Johnson
Posts: 4153
Joined: Mon Feb 18, 2008 3:57 pm
Location: Hazlet, NJ

Re: Acela Express 165mph testing in NJ September 2012

Post by Matt Johnson » Fri Aug 03, 2012 10:45 pm

dt_rt40 wrote:
R36 Combine Coach wrote:Is constant tension used in the rest of the world (Europe, Eastern Asia/Far East) where speeds are rated at 186 or higher?


Yes, and on some slower lines. Even on a relatively "podunk" line like the one from Zaragoza to San Sebastian, Spain, one sees the characteristic weights and pulleys of CT catenary.


Once I realized what constant tension catenary was, I was surprised to see that it in fact exists in my hometown of Hazlet, NJ! The pulleys and weights are clearly visible along NJ Transit's North Jersey Coast Line on the segment from Matawan to Long Branch, which was electrified in the late 80's. (I think electric service beyond Matawan started in 1988.)

25Hz
Posts: 4625
Joined: Thu Oct 13, 2011 4:06 pm
Location: Newtown, PA (or PATH towards WTC)
Contact:

Re: Acela Express 165mph testing in NJ September 2012

Post by 25Hz » Fri Aug 03, 2012 11:09 pm

Around NASSAU has constant tension as well. This is the "fastest" part of the NEC through nj.

The biggest difference to me of the legacy catenary is the constant tension has pulley cradles holding up the wires vs wrap-around bolt clamps.
Next stop the square, journal square station next!

David Benton
Posts: 8441
Joined: Thu Mar 11, 2004 11:29 pm
Location: New Zealand
Contact:

Re: Acela Express 165mph testing in NJ September 2012

Post by David Benton » Sat Aug 04, 2012 3:28 am

We even have constant tension catenary through the middle of the north island in New Zealand . Farmers children use them as swings .
Moderator worldwide railfan , Rail travel & trip reports
The only train trips I regret are the ones I didn't take.

Suburban Station
Posts: 3303
Joined: Sun Jul 22, 2007 5:11 pm

Re: Acela Express 165mph testing in NJ September 2012

Post by Suburban Station » Sat Aug 04, 2012 11:32 am

morris&essex4ever wrote:What's the maximum speed the PRR catenary can handle?

it's my understanding it depends on the weather

25Hz
Posts: 4625
Joined: Thu Oct 13, 2011 4:06 pm
Location: Newtown, PA (or PATH towards WTC)
Contact:

Re: Acela Express 165mph testing in NJ September 2012

Post by 25Hz » Sat Aug 04, 2012 2:44 pm

David Benton wrote:We even have constant tension catenary through the middle of the north island in New Zealand . Farmers children use them as swings .


Do they frequent the hospital from shocks & burns?
Next stop the square, journal square station next!

Post Reply

Return to “Amtrak”