• Green Line Type 9 Thread

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

Moderators: CRail, sery2831

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  by ceo
 
It's a handsome vehicle (sure is better looking than those Type 7 hideosities), but the headlights look like two Mickey Mouse heads. And now you can't unsee that either. :-)
  by bostontrainguy
 
Doesn't look at all like the original drawings they put out.
newgreenline.jpg
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  by MBTA DMA
 
3910 has been accepted.
  by TurningOfTheWheel
 
I would anticipate we get something similar to those Type 9 concept drawings -- ie. standard, off-the-shelf LRVs -- when the Type 10s roll out. The Type 9s are basically a stopgap optimized Type 8.
  by diburning
 
Here's a video by Tim Murphy (an MBTA inspector) showing the underside of a Type 9 (camera is in the gauge). I find it interesting how they were able to fit a "real" truck under the center section unlike the spring loaded stub axles on a Type 8.

https://www.facebook.com/TiminMurphy/vi ... 415820991/

The video is public, you do not need a facebook account to view it.
  by Rbts Stn
 
bostontrainguy wrote: Fri Feb 28, 2020 3:39 pm Doesn't look at all like the original drawings they put out.

newgreenline.jpg
Just can't place that trackage . . .
  by bostontrainguy
 
That's on the new Memorial Drive transitway.
Last edited by CRail on Tue Mar 10, 2020 7:46 pm, edited 1 time in total. Reason: Unnecessary nesting quotes removed. Do not use the "quote" button as a reply button.
  by MBTA DMA
 
3911 has been accepted.
  by Rbts Stn
 
bostontrainguy wrote: Tue Mar 10, 2020 7:58 am That's on the new Memorial Drive transitway.
Ahhh. Leave town for a week and miss out on all the great new trackage plans!
  by BandA
 
diburning wrote: Fri Mar 06, 2020 5:27 am Here's a video by Tim Murphy (an MBTA inspector) showing the underside of a Type 9 (camera is in the gauge). I find it interesting how they were able to fit a "real" truck under the center section unlike the spring loaded stub axles on a Type 8.

https://www.facebook.com/TiminMurphy/vi ... 415820991/

The video is public, you do not need a facebook account to view it.
It's more rumbly than I expected, and seeing exposed gears was a surprise.
  by typesix
 
Those "gears" could be disc brake rotors and the venting fins.
  by bostontrainguy
 
That's a lot faster speed than they used to allow for crossover procedures (maybe 10 mph limit). I guess they have greatly improved the trackage. Also note the "frogless switch" or "lift turnout" frog.
  by Type 7 3684
 
3913 has been accepted
  by Disney Guy
 
I could not see from the video but do Type 9s have real wheelsets (solid wheel-axle-wheel) in the center section? I take it that it would require smaller diameter wheels and/or a slope up in the interior floor going through the center section.

Not counting rotation in unison of opposite wheels, is there a mechanical difference between spring loaded single wheels under the center section and a truck side frame attached by springs but otherwise rigidly to the car underbody (the latter typical of an old fashioned single truck streetcar)?
  by diburning
 
I had assumed that they had full wheelsets (wheel-axle-wheel) under the center section, but after rewatching the video, I can tell that they are stub axles attached to a rigid low profile truck. I don't know how this compares to the setup on a Type 8 though, as I've never seen the underside of the center section of a Type 8.

I don't have an answer for your second question.
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