• 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 RailBus63
 
diburning wrote:The problem is that MBTA buys cars from companies with no experience. Before the MBTA orders, Boeing didn't make light rail vehicles, Breda didn't make light rail vehicles (only subway cars)
Breda did build light-rail cars prior to the Type 8 order (Cleveland, San Francisco)
and Siemens didn't make heavy rail vehicles (only modern LRVs).
Siemens did build heavy-rail metro cars for various systems in Europe and the Far East starting in the 1990's.
Bombardier is a great manufacturer. Those 01800s are near 20 years of service. However, Bombardier hasn't built any light rail vehicles so I wouldn't go with them.
Yes they have - according to their website, "Bombardier has supplied more than 2,500 trams and light rail vehicles to approximately 100 cities in more than 20 countries across the globe."

Hyundai Rotem is the one company you should have put on your list - their light-rail experience is just about nonexistent.
  by sery2831
 
And to add to that, the T didn't seek Boeing out, it was a Government project.
  by jwhite07
 
I would think it unlikely that Breda would be awarded a Type 9 contract in the aftermath of all the problems with the Type 8 procurement... if my memory serves me correctly, they were disqualified from bidding on the Blue Line No. 5 car contract for that reason, and they could still be on the list of persona non grata for future contracts.
  by Arborway
 
Purely conjecture, but I've had this feeling that after the Type 8 debacle, the "We don't care if you're the lowest bidder" thing with the Blue Line order, that the T and Breda somehow made amends. Breda suddenly deciding to build the last five bonus Type 8s for free seemed like penance to me.
  by ferroequinarchaeologist
 
>>The MBTA’s needs for the Green Line are unique – these are a heavy-duty car as streetcars go and this prohibits the Authority from buying an off-the-shelf design.

Railbus, could you expand on this? It's still a mystery to me that Boston can't buy an off-the-shelf car body/undercarriage design.

PBM
  by RailBus63
 
ferroequinarchaeologist wrote:>>The MBTA’s needs for the Green Line are unique – these are a heavy-duty car as streetcars go and this prohibits the Authority from buying an off-the-shelf design.

Railbus, could you expand on this? It's still a mystery to me that Boston can't buy an off-the-shelf car body/undercarriage design.
The main restriction I’m aware of is the tight curves at Park Street which require a narrow front-end profile (even the Breda cars for San Francisco’s Muni are too wide at the ends for the Green Line). There may be other restriction in height and carbody profile required to fit in the line’s 100-year-old tunnels.

Any new cars also have to be capable of pushing or pulling a dead Type 7 or Type 8 car (weighing 85,000 to 90,000 lbs.) along any section of the line, including the various grades. I’m not sure if some of today’s standard designs are heavy enough to do so.
  by StevieC48
 
Intresting to see they are going to try sliding doors again. Hope they do not have 250+ parts per door lol. :wink:
  by MBTA3247
 
I would expect that the sliding doors used on any number of modern LRVs could be used without modification on the Type 9s. Good thing they've had 30-odd years to work out the kinks.
  by Disney Guy
 
StevieC48 wrote:Intresting to see they are going to try sliding doors again.:
In the late 70's or early 80's there was a discussion about the compromises the T had to accept in a nationwide standard LRV (the Boeings): "The T had preferred a folding door...".

But the Type 6 design, which came just before the Boeings, had sliding doors.
RailBus63 wrote:The main restriction I’m aware of is the tight curves at Park Street which require a narrow front-end profile (even the Breda cars for San Francisco’s Muni are too wide at the ends for the Green Line). There may be other restriction in height and carbody profile required to fit in the line’s 100-year-old tunnels.
I would think a longer front overhang might permit setting the motorman's cab further forward, allow freer movement around the front door, and maybe even permit a half width door on the left side behind the cab. The front would have to get even narrower to get around the curves but a very sleek modern appearance could be designed into it. The San Francisco Breda's have this fourth half width door.
  by ags
 
Why is there a concern for cars rated at 55mph when the fastest green line vehicle rarely exceeds 35mph?
  by typesix
 
The current limit for Riverside is 40 mph, but it used to be 50 mph a few years ago and someday may go back to 50 mph.
  by ceo
 
The reasons why the T can't use an off-the-shelf design have to do with the Green Line's >100-year-old infrastructure that was designed for much smaller streetcars: the overall tunnel dimensions are very restrictive, and as mentioned there's the curves at Park Street.

A 100%-low-floor car wouldn't work very well on the Green Line, because those vehicles use independently rotating wheels, like the center truck of a Type 8. Indeed, many of them resemble several slightly longer Type 8 center sections strung together, with the motors on the outsides of the trucks. Remember that one of the main reasons the Type 8s had so much trouble was that the center truck was prone to derailing, in large part because the lack of the solid axles of a conventional truck meant that it couldn't self-steer around curves as well. A 100%-low-floor car would have even more trouble.

The problem with a ramp inside the car is that there wouldn't be room for it, if you wanted the center section to still be useful for wheelchairs. The ramp would have to be entirely in the end sections; it couldn't cross the joint between sections, for obvious geometrical reasons, and it couldn't be where the doors are either. And standing on a ramped floor would get really annoying really quickly.
  by 3rdrail
 
Check out this Bombardier Flexity Streetcar operating up in Vancouver, B.C. What a beauty ! I love the mixed seating. Would love to see this on the Highland Branch !
http://www.youtube.com/watch?v=zR-KPmacYSQ
  by WoofyMutt80
 
I could definitely see that in the future for the green line, only if the T wasn't in debt!
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