Post by Omari NormanPost by The Robinsons* WMATA just built a 3-mile, mostly-underground (cut-fill) suburban
extension for $400 million dollars -- less than the currently
quoted price for the 3-mile first leg of the Purple Line.
I'm still not sure this proves anything with regard to the cost of the
Purple Line segment. Just because Blue to Largo cost $400 million does
not mean that a segment of similar length elsewhere should also cost
$400 million only because it would be the same length. It is possible
that the engineering considerations for Purple would be entirely
different than those for Blue. Watershed conditions might be different,
more stations might be planned for Purple,
Not on the starter segment. I'm intimately familiar with the debacle
that is the Purple Line, unfortunately.
Post by Omari Normandifferent construction
techniques might be needed, etc.
It's a very simple trench dug into a gravel railroad embankment.
The route is already graded and everything. Add extra cost for
a bridge over rock creek that would have to be built anyway.
The rest of the line should be UNDER the trail and cross streets,
which it will be anyway, in large part, if it is built as a trolley.
(Check the maps.)
Post by Omari NormanAt any rate, I do not understand how
it would somehow make the Purple Line less expensive if you make the
platforms hundreds of feet longer and make the curve radii larger (most
light rail vehicles bend in the middle, unlike heavy Metro cars.) These
modifications could only make Purple *more* expensive, not less so.
The curve radius is dependent on the route selected, which is a
freight railroad grade with very wide curve radius. Where were
you in opposition when Maryland planners decided to put the
College Park campus section of the Purple Line underground?
Not to mention the entire Silver Spring and Bethesda sections
of the line would be DEEP underground (hard rock tunnel) if the
line were extended towards White Oak or Langley Park, as the
State has promised it would be. Otherwise it's nothing more
than a real estate venture connecting SS and Bethesda central
business districts allowing them to build taller buildings
(which the law says can only be built if the Purple Line is built).
Post by Omari NormanPost by The Robinsons* O & M Yards and trolley vehicles cost hundreds of millions of
dollars. The existing "unused" capacity on the Red line -- where
Half of all Red Line trains (3 min headways) TERMINATE at Silver
Spring where the Purple Line also terminates. Think about that
for a moment when you question the "needless expense" of making
the Purple Line compatible with existing Red Line infrastructure.
There is a great deal of unused capacity on the Red Line, even between
Grosvenor and Silver Spring, because WMATA runs only 6-car trains. The
platforms are long enough for eight cars, as we all learned during
cleanup from the Woodley Park crash. Further, you seem to be suggesting
that less capital investment in rolling stock would be necessary if
Purple could share equipment with the rest of Metro. I don't understand
why this would be the case because Metro currently uses all its
available equipment during rush hour service. There is no extra
equipment that could be used to run Purple service during rush hour.
Huh? You are saying that Metro is overbuilt because it has capacity
for 8-car trains that it does not use, and would not use in the suburbs.
In point of fact, Metro has a severe car shortage and severe overcrowding
on most of its lines due to $$$ needed for 8-car trainsets, and the
8-car trains will be put into service on long-haul routes serving all the
suburban stations.
As for capital equipment, I don't think I've ever really clarified this
on this forum or elsewhere because I don't think it's ever been discussed.
I think people haven't really considered this:
Half of all Red Line Trains terminate every 6 mins. at Silver Spring
in the NORTHBOUND direction.
All Purple Line trains would terminate every 12 min at Silver Spring
on an ADJACENT PARALLEL TRACK in the SOUTHBOUND direction.
In addition to requiring new trainsets and new O & M technology,
which would need to be made compatible with a proposed conduit-based
DC streetcar fleet that is unlikely to be (re)built in our lifetimes,
The current proposal would require a separate station to be built at
Silver Spring, creating three parallel stations that have no direct
transfer (Metro, MARC and trolley!) The cost of the additional
station alone could be used to buy the Metro trains required to
make the Purple Line a Metro line (although it would not pay for
putting it under the trail for most of its length, which is not
technically necessary, since it is grade separated anyway --
although it will already be under the trail for at least part
of its length under the current proposal.)
This means riders like me -- few of whom are likely to do so in
point of fact -- must leave the system and walk practically around
the block on a vertical rise to catch a trolley which has 1/2 the
frequency/headways of the train they just got off, which entered the
Silver Spring station from the same direction as the trolley departs,
which is no more convenient than catching a bus from Silver Spring
to Bethesda (the J12 Bus, which I sometimes use). In other words,
I suspect there will be very few transfers under the current plan.
Making the initial leg of the Purple Line an OPERATIONAL EXTENSION
of the RED LINE FROM SILVER SPRING TO GROSVENOR would require at most,
one extra train out of a pre-existing Metrorail fleet that has
(or will have) dedicated capital funding for maintenance and acquisition
that has massive, dedicated O & M yards all across the metropolitan area.
Making it a trolley requires siezing all the land around one of the only
two stations on the line for an O & M Yard at Lyttonsville Road, serving
an entirely new fleet of vehicles, with separate mechanics and operators,
rendering the surrounding station area in West Silver Spring (flat, mostly
empty commercially zoned land near the Walter Reed annex) undevelopable.
Post by Omari NormanPost by The Robinsons* There is nothing "massive" about the capacity proposed for the
Purple Line "trolley". Assuming it is not built as an ENTIRELY
grade separated train line (which would cost MORE than building
it as a metro line, since catenary is more expensive than 3rdrail),
it will be "built" as an on-street "busway" along narrow, winding
roads with 12 minute headways between buses or rail vehicles --
less than half of the rush hour capacity of existing bus lines on
the same narrow streets, which would ordinarily be eliminated.
IF YOU DON'T BUILD THE CAPACITY, PEOPLE WON'T COME.
I understand that there is nothing "massive" about the capacity
proposed for the light-rail line; instead I was suggesting that
constructing a system that is compatible with current Metrorail would
involve the installation of massive capacity on Purple--capacity I am
not sure would be utilized.
Well, put it this way, whatever excess capacity exists on the turnback
Red Line trains once all the people depart from them at Silver Spring,
leaving them empty as they perform their 5-minute turnback maneuver,
should be sufficient to provide space for... whatever ridership there is
on the Purple Line, which a trolley at 1/2 the frequency and 1/4 its size
would be maxed out on, before it was ever extended, IF it was ever
extended (and it would cost alot more to put a 16-foot light rail tunnel
deep underground through East Silver Spring, than a 10-foot Metro tunnel).
This is a principle in Metro circles that there is such a thing as
unused turnback capacity. For instance, the Green Line north of
Mount Vernon Square has massive unused capacity in the form of the
existing Yellow Line trains that turn back at Mount Vernon Square.
Unfortunately, all the crowding on the Green Line is in the south
end where the Yellow Line can't serve, and the Yellow Line has few
trains. Even so, WMATA plans on extending half of the existing
Blue line trains to Greenbelt when the Silver Line goes into service
on the Orange/Blue line to take advantage of this unused capacity.
Same principle exists at Silver Spring. Same principle exists at
Grosvenor, in fact; if WMATA wanted, they could build a Red Line
spur to Montgomery Mall along the I-270 Spur without any change to
current operations.
Similarly, MD officials determined that there is "unused turnback
capacity" north of Shady Grove (assuming additional trains are added)
which would make Metro expansion to Germantown much preferable to a
light-rail shuttle from Germantown to Shady Grove in terms of cost
and populsrity. The same sort of determination could be applied here,
methinks. certainly the area around the Purple line is far more urban
than Germantown so is more likely to use the extra capacity. In any
case, Metro to Germantown is a lower priority because they want to
build a light rail line connecting Shady Grove to the office parks
along I-270 south of Gaithersburg. That's a place where light rail
makes sense (wide surface streets, low-density, no existing rapid
transit infrastruture).
Post by Omari NormanI agree with you in that there would be little point in constructing
a non-grade-separated system. That would be a bus on tracks.
I hear you, unfortunately Action Committee for Transit (ACT),
the only transit advocacy group we have in these parts, wants
the Purple Line to be as trolley-like as possible. They actually
objected to increasing the speeds and eliminating grade crossings.
Methinks we need an additional transit advocacy group in DC.
Post by Omari NormanPost by The Robinsons* The Purple Line would run along and in some cases under a busy
rail-trail that is heavily forested. Us Metro-dependent, non-
car owning people are very familiar with the benefits of having
this trail. The only way to avoid completely deforesting the
right-of-way from beginning to end and rendering the trail
worthless for recreation or bikes is to put the rail line
directly under the trail, which runs along an old railroad
grade, as is done in Boston (Davis Squere) and presumably
Morgan Boulevard on the Blue Line extension that JUST OPENED.
I don't care about the trail. The land was purchased for a transit
line, not a trail. Transit would serve many more people than does a
trail. Destroy the trail if that's necessary.
I care about the trail because (a) it makes the rail line feasible
to walk or bike to, and (b) it is an important tree preserve which
is just about the only forested area in the subdivisions it passes
through. It's the only woodland those communities have left.
There's no reason they can't preseve as much as possible by trenching
the rail line under the trail bed, at least in the 1-mile section
between Jones Bridge and East West Highway, like they did in Boston's
Davis Square (although I suspect the problem there was buildings, not
trees). They built a gigantic new trail trestle over Rock Creek
without damaging too many trees by backing in all the earth movers
using the trail as a road.
In any case, if it's going to be grade separated either way,
it does not have to be put underground simply to make it an
operational spur of the RED line.
It could be made into a Metro spur simply by removing the
separate platforms (at Silver Spring) and catenary (along
its entire length) from the current design and removing the
one remaining grade crossing (a driveway). Therefore there
is really no extra cost involved. Putting it in a trench
under the trail bed is purely an environmental measure I am
suggesting, that has nothing to do with what type of trains
are needed (Metro or light rail.)
Post by Omari NormanPost by The Robinsons* You may argue we can no longer afford subways in the suburbs
because the federal government is no longer paying for
anything beyond the ARS. The Blue Line extension that just
opened is not in the ARS. Furthermore, most of the remaining
Purple Line is already underground, even the College Park
section, despite the fact it's completely unnecessary to run
the trains underground through the wide-open College Park campus.
I think aesthetics are worth something, but that's a value judgment
upon which rational people may disagree...
My question is,
what's wrong with an elevated track running along the north side
of campus between Comcast Center and Byrd Stadium (north side of
the Student Center complex curving around the campus). That is
what I assumed. Instead they want a subway running directly under
narrow, winding Campus Drive for 2 miles... That's as much subway
as they're proposing *not* to build on the trail portion, which is
heavily wooded. So I propose we scrap the tunnel in College Park,
which is a wide-open institutional campus suitable for elevated
tracks, even the Paint Branch Parkway portion is suitable for
elevated tracks, and use the savings to do environmental mitigation
(i.e. sinking portions in heavily wooded areas of the rail route).
I care more about the trees than the actual property values.
Post by Omari NormanPost by The Robinsons* The sections of Tysons, Silver Spring, Bethesda, Langley Park
and the College Park campus are more urban than large swaths of the
District and other areas currently served by Metro. Furthermore,
the bulk of Metro ridership comes from the suburbs. The whole
argument against Metro expansion from both Republicans and
Democrats is that suburb-suburb travel is where all the demand
is. They are right. These are concentrated destination points
and there's no good way to get from one point to the other for
those of us without a car. Take away the DC border and you
begin to realize these areas are part of the core urban complex.
I agree...connecting these areas with transit is an excellent idea.
The ideal scenario (regardless of whether it's light rail or heavy rail
although Metro would be more feasible) is a straight shot from Tysons
to Laurel via the Capital Crescent trail --> Burtonsville Road -->
Capital Beltway (between Forest Glen and Four Corners) --> Colesville
Road --> White Oak --> Calverton/Beltsville --> through the massive
new development proposed north of Beltsville on currently empty land -->
CSX "green line" route serving Laurel. This would be a 20-mile
straight shot, serviceable at high speeds.
--Brian