Green Line Type 9 Thread

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.

Doesn't look at all like the original drawings they put out.

3910 has been accepted.

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.

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.

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 . . .

That's on the new Memorial Drive transitway.

3911 has been accepted.

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!

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.

Those "gears" could be disc brake rotors and the venting fins.

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.

3913 has been accepted

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)?

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.